A Lebanon-native who pretended to be an Islamic extremist at the behest of American authorities claims that the FBI took him off the trail of alleged 9/11 plotter Mohammed Atta right as a window of opportunity opened to catch him.

Were it not for the FBI’s action, the informant says he is “one million percent positive” the Sept. 11, 2001 attacks could have been prevented.

RAW STORY has more details here.

This video is from ABC's Nightline, broadcast Sept. 10, 2009.

Download video via RawReplay.com