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Investigating the 9/11 attacks

An archive of NBC News investigations focusing on the 9/11 attacks.

Sept. 23, 2004: Three years later, no-fly list still lacking

July 26, 2004: Did al-Qaida trainee warn the FBI before 9/11?

July 21, 2004: Hardball Special Report: Hindsight & the attacks on America

May 28, 2004: Ashcroft terror threat source questionable

April 29, 2004: Customs agent says foiling millennium plot was mostly luck

April 9, 2004: Sources say Ashcroft to be criticized at 9/11 hearings

April 1, 2004: Memo outlines al-Qaida terror plans

March 29, 2004: Did Richard Clarke tell Congress the truth?

Feb. 25, 2004: FBI agents took ground zero souveniers