Hiển thị các bài đăng có nhãn found. Hiển thị tất cả bài đăng
Hiển thị các bài đăng có nhãn found. Hiển thị tất cả bài đăng

Thứ Ba, 14 tháng 5, 2013

Canadian man, missing after truck test drive, found dead

TORONTO (Reuters) - A Canadian man who went missing after he took two men for a test drive in a truck he was trying to sell online has been found dead, Canadian police said on Tuesday.

Police also said murder charges will be brought on Wednesday against the only suspect so far in custody in the case - the heir to a Canadian airline business operation, who was arrested last week and charged with theft and forcible confinement.

Tim Bosma, 32, vanished on May 6 from his home in Ancaster, Ontario. Police said they had found his burned remains but did not reveal the cause of death.

"We are convinced by the totality of the evidence that these are the remains of Tim Bosma," Glenn De Caire, police chief in Hamilton, Ontario, a city of 520,000 about 70 km (40 miles) southwest of Toronto, told reporters. Ancaster is just outside Hamilton.

The man arrested is Dellen Millard, 27, police said on Saturday. Millard, who inherited family-owned aircraft maintenance company Millardair when his father died last year, once held the world record for youngest solo helicopter flight, the Toronto Star newspaper said.

Police said they are now seeking two more suspects in the murder. They said they believe Bosma left the house with two suspects in his truck, while a third followed in another vehicle.

"The investigation is long from over," De Caire said.

(Reporting by Cameron French; Editing by Peter Galloway and Eric Beech)


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Thứ Năm, 4 tháng 4, 2013

Antarctic Blue Whales Found With Sound

Whales may be the biggest animals on Earth, but finding them in the vast open ocean isn't easy.

Now, an Australia-led research team has demonstrated a novel idea for chasing down the massive marine mammals. To search for Antarctic blue whales, the group dropped sonar buoys in the Ross Sea west of Antarctica, and listened for whale calls. They triangulated the whale's location from their calls, and then sailed to the right spot.

During the research cruise, the scientists photographed 57 blue whales, collected 23 skin biopsy samples and stuck on two satellite-tracking tags. They also spotted 11 pygmy blue whales and eight humpback whales, among a total 720 cetacean species (the group that includes whales, dolphins and porpoises).

"In many respects our expectations of what we could achieve have been exceeded," the scientists wrote on the expedition's blog.

The deep, resonating song of Antarctic blue whales travels hundreds of kilometers across the Southern Ocean, Brian Miller, of the Australian Antarctic Division  and the lead marine mammal acoustician of the mission, said in a statement. The team returned with 626 hours of recordings, with 26,545 blue whale calls analyzed in real time. [See how they found the whales]

The whale's satellite tags will transmit never-before obtained data on how the whales feed near the edge of the Antarctic ice, marine biologist Virginia Andrews-Goff of the Australian Marine Mammals Center said in a statement.

The International Whaling Commission estimates the population of Antarctic blue whales is between 400 and 1,400 individuals. The leviathans were slaughtered to near extinction in the early 1900s by whalers, who took some 340,000 whales, according to a statement from the Australian government.

Researchers worldwide have used acoustic technology to track whale species for decades, including blue whales, humpback whales and right whales. This is the first time that scientists have located whales for tagging and identification by identifying their positions with sonar, the statement said.

Email Becky Oskin or follow her @beckyoskin. Follow us @OAPlanet, Facebook or Google+. Original article on LiveScience's OurAmazingPlanet.

Copyright 2013 LiveScience, a TechMediaNetwork company. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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Thứ Sáu, 29 tháng 3, 2013

Sumatran rhino footprints believed found on Borneo

JAKARTA, Indonesia (AP) — Several footprints believed to be from critically endangered Sumatran rhino have been found on Indonesia's Borneo island, raising hopes for the existence of an animal long thought to be extinct in that area, a conservation group said Thursday.

The fresh tracks were discovered in February while a WWF team was monitoring orangutans in West Kutai forested district of East Kalimantan province, according to a statement.

A follow-up survey carried out by the team, along with government forestry officials and scientists from Mulawarman University, discovered more footprints, horn scratches at mud holes, trees used as rubbing posts and bite marks on plants. But the number of potential animals remains unclear.

The rhino has been thought to be extinct on Indonesia's part of Borneo since the 1990s. Fewer than 200 animals still live in the wild in Indonesia and Malaysia, threatened by loss of habitat and poaching.


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Thứ Ba, 19 tháng 3, 2013

Antarctic's First-Ever Whale Skeleton Found

For the first time ever, scientists say they have discovered a whale skeleton on the ocean floor near Antarctica. Resting nearly a mile below the surface, the boneyard is teeming with strange life, including at least nine new species of tiny of deep-sea creatures, according to a new study.

Though whales naturally sink to the ocean floor when they die, it's extremely rare for scientists to come across these final resting places, known as "whale falls." Discovering one typically requires a remote-controlled undersea vehicle and some luck.

"At the moment, the only way to find a whale fall is to navigate right over one with an underwater vehicle," study researcher Jon Copley, of the University of Southampton in England, said in a statement. The team's chance encounter with a 35-foot-long (10.7 meter) spread of bones that belonged to a southern Minke whale came as they were exploring an undersea crater near the South Sandwich Islands.

"We were just finishing a dive with the U.K.'s remotely operated vehicle, Isis, when we glimpsed a row of pale-coloured blocks in the distance, which turned out to be whale vertebrae on the seabed," Copley explained.

When whales die and sink to the ocean floor, their carcasses provide nutritional boosts and habitats for deep-sea life. Though their flesh decomposes within weeks, whale bones can last anywhere from 60 to 100 years, supporting bacteria and strange creatures like zombie worms, which are mouthless, eyeless animals that feed off the skeletons.

"The planet's largest animals are also a part of the ecology of the very deep ocean, providing a rich habitat of food and shelter for deep sea animals for many years after their death," said Diva Amon, another University of Southampton researcher. "Examining the remains of this southern Minke whale gives insight into how nutrients are recycled in the ocean, which may be a globally important process in our oceans."

The Antarctic whale fall, thought to have been on the seafloor for several decades, was surveyed using high-definition cameras, and samples were collected to be studied back on land. The team encountered several new species of sea snails and worms that were living off the bones. They found a new species of isopod crustacean, similar to woodlice, crawling over the skeleton, according to a statement from the U.K. National Oceanography Centre. The researchers also found an undescribed species of zombie worms (Osedax), which could help scientists study how the mysterious species has managed to become surprisingly diverse and widespread. (They've been found in whale falls in the eastern and western Pacific as well as the North Atlantic.)

"One of the great remaining mysteries of deep ocean biology is how these tiny invertebrates can spread between the isolated habitats these whale carcasses provide on the seafloor," Adrian Glover, a researcher at the Natural History Museum in London, said in a statement.

A recent study suggested that the sex strategy of zombie worms is the key to their success. Females of the species Osedax japonica quickly mature and then constantly produce eggs that harems of dwarf males fertilize, scientists found. What's more, zombie worm larvae can swim actively for at least 10 days before settling on bones on the ocean floor, according to the new research, detailed last month in the journal Naturwissenschaften.

The study of the whale fall was recently published online in the journal Deep-Sea Research II: Topical Studies in Oceanography.

Email Megan Gannon or follow her @meganigannon. Follow OurAmazingPlanet @OAPlanet, Facebook and Google+. Original article on LiveScience's OurAmazingPlanet.

Copyright 2013 LiveScience, a TechMediaNetwork company. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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Thứ Hai, 11 tháng 3, 2013

Mysterious bacterium found in Antarctic lake

MOSCOW (AP) — A new form of microbial life has been found in water samples taken from a giant freshwater lake hidden under kilometers of Antarctic ice, Russian scientists said Monday.

Sergei Bulat and Valery Lukin said in a statement that the "unidentified and unclassified" bacterium has no relation to any of the existing bacterial types. They acknowledged, however, that extensive research of the microbe that was sealed under the ice for millions of years will be necessary to prove the find and determine the bacterium's characteristics.

New samples of water retrieved from Lake Vostok earlier this year are expected to be delivered to St. Petersburg in May aboard a Russian ship.

The Russian team reached the surface of the subglacial lake in February 2012 after more than two decades of drilling, a major achievement hailed by scientists around the world.

They touched the lake water Sunday at a depth of 12,366 feet (3,769 meters), about 800 miles (1,300 kilometers) east of the South Pole in the central part of the continent.

Scientists hope the lake might allow a glimpse into microbial life forms that existed before the Ice Age and could have survived in the dark depths of the lake, despite its high pressure and constant cold — conditions similar to those which also are believed to be found under the ice crust on Mars, Jupiter's moon Europa and Saturn's moon Enceladus.

At 250 kilometers (160 miles) long and 50 kilometers (30 miles) wide, Lake Vostok is similar in size to Lake Ontario. It is kept from freezing into a solid block by the kilometers (miles)-thick crust of ice across it that acts like a blanket, keeping in heat generated by geothermal energy underneath.

Some have voiced concern that the more than 60 tons of lubricants and antifreeze used in the drilling may contaminate the lake, but the Russian researchers have insisted that their technology is environmentally secure. They said water from the lake rushed up the borehole once the drill touched the surface and froze, safely sealing the lubricants from the lake's pristine waters.

Bulat and Lukin said the research team has done a meticulous analysis of the samples to differentiate bacteria contained in lubricants from what they hoped could be a trace of new life forms. Initial studies only spotted bacteria associated with the lubricants, but scientists said they eventually found one bacterium that didn't fall into any of the known categories.

The researchers said that the small size of the initial sample and its heavy contamination made it difficult to conduct more extensive research. They voiced hope that the new samples of clean frozen water that are to arrive in St. Petersburg this spring will make it possible to "confirm the find and, perhaps, discover new previously unknown forms of microbial life."

A U.S. team that recently touched the surface of Lake Whillans, a shallower subglacial body of water west of the South Pole, also found microbes. The scientists are yet to determine what forms of bacteria they found.


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Chủ Nhật, 10 tháng 3, 2013

New Type of Bacteria Reportedly Found in Buried Antarctic Lake

A new type of microbe has been found at a lake buried under Antarctica's thick ice, according to news reports. The find may unveil clues of the surrounding environment in the lake, according to scientists.

The bacteria, said to be only 86 percent similar to other types known to exist on Earth, was discovered in a water sample taken from Lake Vostok, which sits under more than 2 miles (3 kilometers) of Antarctic ice. The freshwater lakehas likely been buried, unaltered, under the ice for the past million years.

Russian scientists reportedly obtained the water samples in 2012 when they drilled all the way down to the lake's surface. They ran the bacteria's composition through a global database and were not able to find anything similar to its type. Scientists couldn't even figure out the bacteria's descendents.

"After putting aside all possible elements of contamination, DNA was found that did not coincide with any of the well-known types in the global database," said Sergey Bulat, a geneticist at the Saint Petersburg Institute of Nuclear Physics, in a quote attributed in media reports to RIA Novosti news service.

"We are calling this life form unclassified and unidentified," he added.

Understanding the environment

While the bacteria still needs to be confirmed, its potential is already drawing attention from other Antarctic scientists.

Life forms are shaped by the environment they live in, and often shape that environment in return. Finding out more about bacteria in Lake Vostok, therefore, will help researchers picture what living in the lake is like for these tiny microorganisms.

"The study of looking at the organisms and their environment is really the study of ecology," said Alison Murray, an associate research professor at the Desert Research Institute (an environmental research group based in Nevada) who also does Antarctic research herself.

"By learning more about the life forms that live in Vostok, that will probably teach us a bit about the lake itself," Murray told OurAmazingPlanet.

Murray, who is familiar with the Russian researchers' work, said the group is a "very careful team of scientists" who would have put the bacteria through several validity tests before releasing the news.

Understanding bacterial life on Earth is also considered a possible research direction for finding life on other planets, including Mars.

'If this is real, it is very exciting'

The 86 percent similarity figure, to Murray, is a plausible indicator that this could be a new type of bacteria. Since all Earthly life is related to each other in some way, anything below about 80 percent would draw concern, Murray added.

At least one other scientist, however, expressed caution about the finding, saying that more information is needed before drawing conclusions.

"If this is real, it is very exciting," Peter Doran, a microbiologist at the University of Illinois at Chicago, wrote in an e-mail to OurAmazingPlanet. He is a frequent visitor to the Arctic and Antarctica for his research.

"I would caution, though, that this type of 'press release' science is a little dangerous. It really needs to go through the rigor of peer review by other experts in the field before I'll jump on board," he said. "Having others looking at their methods and data will provide support for their conclusions."

Russian scientists successfully dug through to the buried lake again in January this year, retrieving more samples for later analysis.

Meanwhile, a British team had to call off their quest in December to dig to Lake Ellsworth, another Antarctic subglacial lake, after they encountered technical difficulties.

Follow Elizabeth Howell @howellspace. Follow OurAmazingPlanet @OAPlanet,Facebookand Google+.

Copyright 2013 LiveScience, a TechMediaNetwork company. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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Thứ Sáu, 1 tháng 3, 2013

No trauma signs on body of Canadian woman found in L.A. hotel water tank

LOS ANGELES (Reuters) - The autopsy of a 21-year-old Canadian student found dead in a water tank atop a historic Los Angeles hotel turned up no fatal wounds, offering no clear answers to her puzzling last days and death, coroner's officials said on Friday.

The inconclusive finding means that further tests must be conducted to determine a cause of death for Elisa Lam, who went missing from the Cecil Hotel in downtown Los Angeles under suspicious circumstances in late January.

Lam's body was found floating in one of four large water tanks on the hotel's roof on Tuesday after guests complained of low water pressure in their rooms. Health officials have issued a do-not-drink order for hotel water until it is tested.

Police have said that detectives had been hoping the autopsy would help determine if her death was the result of an accident or foul play.

"They didn't find any bullet holes, they didn't find any stab wounds to my knowledge. So then you've got to go to the next step," Los Angeles County Coroner's spokesman Ed Winter said.

He said coroner's investigators would conduct toxicology tests to establish if Lam was on any medication at the time of her death and if it was at therapeutic levels. Her organs will also be studied to determine if she suffered from any medical issues.

"You see if in fact there were any heart issues, did she die of hypothermia, did she drown," said Winter. "Were her lungs filled with water?"

Lam, a college student from Vancouver, British Columbia, was last seen by staff at the hotel on January 31 and detectives had characterized her disappearance as suspicious. She had been traveling alone but in regular contact with her family in Canada.

Police say the reason for Lam's visit to Southern California was unclear but that her final destination was expected to have been Santa Cruz in central California.

Security video taken in an elevator of the hotel and released by police last week showed her acting strangely, hiding in a corner, pushing multiple buttons and repeatedly peering around the elevator doors into a hallway.

Her body was discovered in one of the four large, cylindrical tanks supplying water to guest rooms at the art deco hotel, which was built in the 1920s and is considered a local landmark.

Local public radio KPCC reported that the hotel has had dark chapters in its long history, including murders in the '20s and '30s and a woman who leapt from a window in the 1960s.

The radio station said that two serial killers were known to have stayed there in the 1980s: Richard Ramirez, known as the "Night Stalker," and Austrian murderer Jack Unterweger.

Firefighters removed the remains by cutting through the side of the tank under a canopy that shielded them from news helicopters overhead.

(Reporting by Dan Whitcomb; Editing by Cynthia Johnston and Dan Grebler)


View the original article here

Chủ Nhật, 24 tháng 2, 2013

Zimbabwe says it has found funds for a referendum

HARARE, Zimbabwe (AP) — Zimbabwe's broke coalition government says it has raised enough money privately to pay for a referendum on a new constitution scheduled March 16.

Justice Minister Patrick Chinamasa said the vote, just three weeks away, "will not be stopped because of lack of money," the state Sunday Mail newspaper reported.

Chinamasa said the financing was "sourced locally" from commercial and business interests after the United Nations and possible outside donors weren't given enough time to contribute. The referendum date was announced a week ago.

The state election commission says it needs $85 million for the vote ahead of national elections later in the year to end the nation's shaky coalition between President Robert Mugabe and the former opposition formed after the violent and disputed elections in 2008.

All coalition leaders have called for a 'Yes' vote on the new constitution.

Finance Minister Tendai Biti said the United Nations cited bureaucratic procedures preventing it from providing referendum money, adding "we submitted our budgets a bit late," the Sunday Mail reported.

"I think they are going to fund the actual election but this time (for the referendum) we are going it alone," the paper quoted Biti saying. Biti is the third ranking official in Prime Minister Morgan Tsvangirai's party.

Presidential and parliamentary elections are expected to be held around July.

Rights and democracy groups have called for a postponement of the referendum to give voters more time to study the 160-page draft constitution first published last Monday. They insist a hasty vote will not produce a credible outcome.

Vice President Joice Mujuru said Saturday no Western observers will be allowed into the country to monitor either of the upcoming polls.

Only African and regional observers will be permitted as election monitors, she said while addressing a state funeral in Harare, in the absence of Mugabe, who was on an official trip to West Africa.

Western nations hostile to Mugabe sought to infiltrate the country as monitors to influence the outcome of voting in their favor, Mujuru said.

"Let us be wary of foreign interference in our internal politics," she said.

Mugabe expelled a European Union observer mission during elections in 2002 that the European monitors alleged were marred by violence and vote rigging.

Western donors give the bulk of pledges to United Nations appeals for funds to help member states.

The official election commission says that in a departure from usual election practice the voters' lists will not be used in the March 16 referendum. Voters aged 18 and above can cast their ballots in any of 9,000 polling states across the country using only valid national identity cards.

That procedure would mean a larger voter turnout within the time constraints up to referendum, it says.

In previous parliament and presidential elections, glaring errors in the voters' lists, including registered voters who have long since died or have moved to other districts, were blamed for vote rigging and fraud.


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Thứ Sáu, 22 tháng 2, 2013

No trauma signs on body of Canadian woman found in L.A. hotel water tank

LOS ANGELES (Reuters) - The autopsy of a 21-year-old Canadian student found dead in a water tank atop a historic Los Angeles hotel turned up no fatal wounds, offering no clear answers to her puzzling last days and death, coroner's officials said on Friday.

The inconclusive finding means that further tests must be conducted to determine a cause of death for Elisa Lam, who went missing from the Cecil Hotel in downtown Los Angeles under suspicious circumstances in late January.

Lam's body was found floating in one of four large water tanks on the hotel's roof on Tuesday after guests complained of low water pressure in their rooms. Health officials have issued a do-not-drink order for hotel water until it is tested.

Police have said that detectives had been hoping the autopsy would help determine if her death was the result of an accident or foul play.

"They didn't find any bullet holes, they didn't find any stab wounds to my knowledge. So then you've got to go to the next step," Los Angeles County Coroner's spokesman Ed Winter said.

He said coroner's investigators would conduct toxicology tests to establish if Lam was on any medication at the time of her death and if it was at therapeutic levels. Her organs will also be studied to determine if she suffered from any medical issues.

"You see if in fact there were any heart issues, did she die of hypothermia, did she drown," said Winter. "Were her lungs filled with water?"

Lam, a college student from Vancouver, British Columbia, was last seen by staff at the hotel on January 31 and detectives had characterized her disappearance as suspicious. She had been traveling alone but in regular contact with her family in Canada.

Police say the reason for Lam's visit to Southern California was unclear but that her final destination was expected to have been Santa Cruz in central California.

Security video taken in an elevator of the hotel and released by police last week showed her acting strangely, hiding in a corner, pushing multiple buttons and repeatedly peering around the elevator doors into a hallway.

Her body was discovered in one of the four large, cylindrical tanks supplying water to guest rooms at the art deco hotel, which was built in the 1920s and is considered a local landmark.

Local public radio KPCC reported that the hotel has had dark chapters in its long history, including murders in the '20s and '30s and a woman who leapt from a window in the 1960s.

The radio station said that two serial killers were known to have stayed there in the 1980s: Richard Ramirez, known as the "Night Stalker," and Austrian murderer Jack Unterweger.

Firefighters removed the remains by cutting through the side of the tank under a canopy that shielded them from news helicopters overhead.

(Reporting by Dan Whitcomb; Editing by Cynthia Johnston and Dan Grebler)


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Body found in LA hotel water tank may be missing Canadian tourist

LOS ANGELES (Reuters) - A body found in a water tank on the roof of a historic Los Angeles hotel has been identified as that of a 21-year-old Canadian woman who went missing in late January, police said on Wednesday.

The body, which was discovered on Tuesday morning in one of four water tanks on top of the Cecil Hotel in downtown Los Angeles, has been positively identified as that of Elisa Lam by members of her family, Los Angeles Police Department spokesman Lt. Andy Nieman said.

"The coroner has confirmed that it is Elisa Lam based on some distinctive markings on her body," Neiman said. "They had confirmation from the family based on those markings."

A coroner's spokesman declined to release further information on the condition of the remains pending an autopsy that he said would likely take place on Thursday.

Lam, a 21-year-old college student from Vancouver, British Columbia, was last seen by staff at the hotel on January 31, and police detectives had characterized her disappearance as suspicious.

Police have said that the reason for Lam's visit to Southern California was unclear but that her final destination was expected to be Santa Cruz in Central California.

Security video taken in an elevator of the hotel and released by the LAPD last week showed her acting strangely, hiding in a corner, pushing multiple buttons and repeatedly peering around the elevator doors into a hallway.

The body was discovered in one of the four large, cylindrical tanks by a maintenance worker investigating guest complaints of low water pressure at the art deco hotel, which was built in 1927 and is considered a local landmark.

Firefighters removed the remains by cutting through the side of the tank under a canopy that shielded them from news helicopters overhead.

Neiman said detectives were investigating Lam's death but said it was too early to say conclusively that she had been the victim of foul play.

"There are a lot of possibilities. She may have climbed into the tank not knowing what it was and fell in or there could be something suspicious about how she got in tank," he said.

The doors and other access points that lead to the roof are secured and alarmed, Neiman said, but investigators were trying to determine if she could have climbed up on a fire escape.

He said detectives expected to learn more from the results of the autopsy but cautioned that toxicology tests typically took at least several weeks to complete.

Los Angeles police say they were contacted by Canadian authorities after her parents reported her missing there.

(Reporting by Dan Whitcomb; editing by Carol Bishopric)


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Al-Qaida tipsheet on avoiding drones found in Mali

TIMBUKTU, Mali (AP) — One of the last things the bearded fighters did before leaving this city was to drive to the market where traders lay their carpets out in the sand.

The al-Qaida extremists bypassed the brightly colored, high-end synthetic floor coverings and stopped their pickup truck in front of a man selling more modest mats woven from desert grass, priced at $1.40 apiece. There they bought two bales of 25 mats each, and asked him to bundle them on top of the car, along with a stack of sticks.

"It's the first time someone has bought such a large amount," said the mat seller, Leitny Cisse al-Djoumat. "They didn't explain why they wanted so many."

Military officials can tell why: The fighters are stretching the mats across the tops of their cars on poles to form natural carports, so that drones cannot detect them from the air.

The instruction to camouflage cars is one of 22 tips on how to avoid drones, listed on a document left behind by the Islamic extremists as they fled northern Mali from a French military intervention last month. A Xeroxed copy of the document, which was first published on a jihadist forum two years ago, was found by The Associated Press in a manila envelope on the floor of a building here occupied by al-Qaida of the Islamic Maghreb.

The tipsheet reflects how al-Qaida's chapter in North Africa anticipated a military intervention that would make use of drones, as the battleground in the war on terror worldwide is shifting from boots on the ground to unmanned planes in the air. The presence of the document in Mali, first authored by a Yemeni, also shows the coordination between al-Qaida chapters, which security experts have called a source of increasing concern.

"This new document... shows we are no longer dealing with an isolated local problem, but with an enemy which is reaching across continents to share advice," said Bruce Riedel, a 30-year veteran of the CIA, now the director of the Intelligence Project at the Brookings Institution.

The tips in the document range from the broad (No. 7, hide from being directly or indirectly spotted, especially at night) to the specific (No 18, formation of fake gatherings, for example by using dolls and statues placed outside false ditches to mislead the enemy.) The use of the mats appears to be a West African twist on No. 3, which advises camouflaging the tops of cars and the roofs of buildings, possibly by spreading reflective glass.

While some of the tips are outdated or far-fetched, taken together, they suggest the Islamists in Mali are responding to the threat of drones with sound, common-sense advice that may help them to melt into the desert in between attacks, leaving barely a trace.

"These are not dumb techniques. It shows that they are acting pretty astutely," said Col. Cedric Leighton, a 26-year-veteran of the United States Air Force, who helped set up the Predator drone program, which later tracked Osama bin Laden in Afghanistan. "What it does is, it buys them a little bit more time — and in this conflict, time is key. And they will use it to move away from an area, from a bombing raid, and do it very quickly."

The success of some of the tips will depend on the circumstances and the model of drones used, Leighton said. For example, from the air, where perceptions of depth become obfuscated, an imagery sensor would interpret a mat stretched over the top of a car as one lying on the ground, concealing the vehicle.

New models of drones, such as the Harfung used by the French or the MQ-9 "Reaper," sometimes have infrared sensors that can pick up the heat signature of a car whose engine has just been shut off. However, even an infrared sensor would have trouble detecting a car left under a mat tent overnight, so that its temperature is the same as on the surrounding ground, Leighton said.

Unarmed drones are already being used by the French in Mali to collect intelligence on al-Qaida groups, and U.S. officials have said plans are underway to establish a new drone base in northwestern Africa. The U.S. recently signed a "status of forces agreement" with Niger, one of the nations bordering Mali, suggesting the drone base may be situated there and would be primarily used to gather intelligence to help the French.

The author of the tipsheet found in Timbuktu is Abdallah bin Muhammad, the nom de guerre for a senior commander of al-Qaida in the Arabian Peninsula, the Yemen-based branch of the terror network. The document was first published in Arabic on an extremist website on June 2, 2011, a month after bin Laden's death, according to Mathieu Guidere, a professor at the University of Toulouse. Guidere runs a database of statements by extremist groups, including al-Qaida in the Islamic Maghreb, and he reviewed and authenticated the document found by the AP.

The tipsheet is still little known, if at all, in English, though it has been republished at least three times in Arabic on other jihadist forums after drone strikes took out U.S.-born cleric Anwar al-Awlaki in Yemen in September 2011 and al-Qaida second-in-command Abu Yahya al-Libi in Pakistan in June 2012. It was most recently issued two weeks ago on another extremist website after plans for the possible U.S. drone base in Niger began surfacing, Guidere said.

"This document supports the fact that they knew there are secret U.S. bases for drones, and were preparing themselves," he said. "They were thinking about this issue for a long time."

The idea of hiding under trees to avoid drones, which is tip No. 10, appears to be coming from the highest levels of the terror network. In a letter written by bin Laden and first published by the U.S. Center for Combating Terrorism, the terror mastermind instructs his followers to deliver a message to Abdelmalek Droukdel, the head of al-Qaida in the Islamic Maghreb, whose fighters have been active in Mali for at least a decade.

"I want the brothers in the Islamic Maghreb to know that planting trees helps the mujahedeen and gives them cover," bin Laden writes in the missive. "Trees will give the mujahedeen the freedom to move around especially if the enemy sends spying aircrafts to the area."

Hiding under trees is exactly what the al-Qaida fighters did in Mali, according to residents in Diabaly, the last town they took before the French stemmed their advance last month. Just after French warplanes incinerated rebel cars that had been left outside, the fighters began to commandeer houses with large mango trees and park their four-by-fours in the shade of their rubbery leaves.

Hamidou Sissouma, a schoolteacher, said the Islamists chose his house because of its generous trees, and rammed their trucks through his earthen wall to drive right into his courtyard. Another resident showed the gash the occupiers had made in his mango tree by parking their pickup too close to the trunk.

In Timbuktu also, fighters hid their cars under trees, and disembarked from them in a hurry when they were being chased, in accordance with tip No. 13.

Moustapha al-Housseini, an appliance repairman, was outside his shop fixing a client's broken radio on the day the aerial bombardments began. He said he heard the sound of the planes and saw the Islamists at almost the same moment. Abou Zeid, the senior al-Qaida emir in the region, rushed to jam his car under a pair of tamarind trees outside the store.

"He and his men got out of the car and dove under the awning," said al-Housseini. "As for what I did? Me and my employees? We also ran. As fast as we could."

Along with the grass mats, the al-Qaida men in Mali made creative use of another natural resource to hide their cars: Mud.

Asse Ag Imahalit, a gardener at a building in Timbuktu, said he was at first puzzled to see that the fighters sleeping inside the compound sent for large bags of sugar every day. Then, he said, he observed them mixing the sugar with dirt, adding water and using the sticky mixture to "paint" their cars. Residents said the cars of the al-Qaida fighters are permanently covered in mud.

The drone tipsheet, discovered in the regional tax department occupied by Abou Zeid, shows how familiar al-Qaida has become with drone attacks, which have allowed the U.S. to take out senior leaders in the terrorist group without a messy ground battle. The preface and epilogue of the tipsheet make it clear that al-Qaida well realizes the advantages of drones: They are relatively cheap in terms of money and lives, alleviating "the pressure of American public opinion."

Ironically, the first drone attack on an al-Qaida figure in 2002 took out the head of the branch in Yemen — the same branch that authored the document found in Mali, according to Riedel. Drones began to be used in Iraq in 2006 and in Pakistan in 2007, but it wasn't until 2009 that they became a hallmark of the war on terror, he said.

"Since we do not want to put boots on the ground in places like Mali, they are certain to be the way of the future," he said. "They are already the future."

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Associated Press writers Baba Ahmed in Timbuktu, Mali, Robert Burns in Washington and Dalatou Mamane in Niamey, Niger contributed to this report.

The document can be seen in Arabic and English at http://hosted.ap.org/specials/interactives/_international/_pdfs/al-qaida-papers-drones.pdf.

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Rukmini Callimachi can be reached at www.twitter.com/rcallimachi

Baba Ahmed can be reached at www.twitter.com/babahmed1


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