Walid Arkeh Events (3) August 21, 2001: Inmate Warns of Impending Attack in New York 2001-08-21 August 22, 2001: Top FBI Al-Qaeda Expert Leaves FBI in Frustration; Misses Important Warnings 2001-08-22 May 21-22, 2002: Prisoner Told FBI of Imminent Al-Qaeda Attacks before 9/11 2002-05-21