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updated 9/3/2011 9:25:33 PM ET 2011-09-04T01:25:33

The FBI and Homeland Security have issued a nationwide warning about al-Qaida threats to small airplanes, just days before the anniversary of the 2001 terrorist attacks.

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Authorities say there is no specific or credible terrorist threat for the 10-year anniversary of the attacks on the World Trade Center and Pentagon. But they have stepped up security nationwide as a precaution.

According to a five-page law enforcement bulletin issued Friday, as recently as early this year, al-Qaida was considering ways to attack airplanes.

The alert, issued ahead of the summer's last busy travel weekend, said terrorists have considered renting private planes and loading them with explosives.

"Al-Qaida and its affiliates have maintained an interest in obtaining aviation training, particularly on small aircraft, and in recruiting Western individuals for training in Europe or the United States, although we do not have current, credible information or intelligence of an imminent attack being planned," according to the bulletin obtained by The Associated Press.

The bulletin also says al-Qaida would like to use sympathetic Westerners to get flight training, then get them to become flight instructors.

Matthew Chandler, a spokesman for the Department of Homeland Security, described the bulletin as routine.

"We shared this information with our partners to highlight the need for continued awareness and vigilance," he said.

Aviation security is much tighter than it was a decade ago, but al-Qaida remains keenly interested in launching attacks on airplanes, believing large attacks with high body counts are more likely to grab headlines.

Threats to small airplanes are nothing new. After the 2001 attacks, the government grounded thousands of crop dusters amid fears the planes could be used in an attack.

In 2002, U.S. officials said they uncovered an al-Qaida plot to fly a small plane into a U.S. warship in the Persian Gulf. And in 2003, U.S. officials uncovered an al-Qaida plot to crash an explosives-laden small aircraft into the American consulate in Karachi, Pakistan.

Copyright 2011 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

Timeline: Al-Qaida timeline

Video: Al-Qaida website calls for Letterman’s death

  1. Closed captioning of: Al-Qaida website calls for Letterman’s death

    >>> the death threat against david letterman made on an al qaeda website. a correspondent here from the nbc station in new york is here with the details. good to see you.

    >> good morning.

    >> david letterman was informed of the threat. what was the threat? what prompted it?

    >> there's a website overseas that jihadists posted threats and rants. one said cut the tongue off of the lowly jew because he's been making comments about the parents killed by the military. he's not jewish. but nonetheless, the fbi and nypd take threats like this seriously. they alerted the comedian and took some expert security precautions but no specific plot.

    >> they want to. and they want to look into it. they're not saying this is a credible plot or this individual had taken any threats to execute the threat.

    >> no specific plot. there's chatter oud there. when a lone actor acts based on rhetoric posted on a known al qaeda website. that's a concern. but nothing indicating that the person posting this is a real al qaeda leader, they don't know yet. they're investigating trying to find out.

    >> this is a real al qaeda website. one official called it the premier forum for al qaeda .

    >> it's been use in the past to make specific and real threats and claimed responsibility that al qaeda is behind the norway attacks. there's been real stuff on there.

    >> never be too careful.

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