11/10/2009 05:12 am ET Updated May 25, 2011

FBI Agents Missed Chance To Stop Atta, Informant Says

On the eve of the eight year anniversary of the 9/11 attacks, an FBI informant who infiltrated alleged terrorist cells in the U.S. tells ABC News the FBI missed a chance to stop the al Qaeda plot because they focused more on undercover stings than on the man who would later become known as 9/11 ringleader Mohammed Atta.

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