The following documents have been declassified by the CIA pertaining to the 9/11 attacks.

Central Intelligence Agency (CIA) Inspector General Report on 9/11/01

 OIG Report on CIA Accountability with Respect to the 9/11 Attacks – Executive Summary [19 Pages, 1MB]

 Inspection Report of the DCI Counter-Terrorist Center Directorate of Operations, August 2001  [81 Pages, 1.68MB]

 Joint Response to Draft IG 9/11 Report  [15 Pages, 1.05MB]

 Joint Response to OIG Report – “Accountability Regarding Findings and Conclusions of the Joint” [18 Pages, 1.20MB]

 Memorandum to Inspector General Helgerson from George J. Tenet Regarding Assessment of Performance [19 Pages, 1.44MB]

 Office of Inspector General Report on Central Intelligence Agency Accountability Regarding Findings [490 Pages, 17.9MB]

 Response to Inspector General’s 9/11 Accountability Final Draft Report [10 Pages, 0.8MB]
 Response to Inspector General’s 9/11 Accountability Final Draft Report – MDR Release 23 July 2021 (No new information was released) [11 Pages, 0.8MB]

Interrogation

CIA/OIG Report on Counterterrorism Detention and Interrogation Activities, 07 May 2004