that its "sources confirm... that the CIA has only used this interrogation method against three terrorist detainees and not since 2003." John Kiriakou, a former CIA officer, is the first official within the U.S. government to openly admit to the use of waterboarding as an interrogation technique, as of 10 December 2007. On 6 February 2008, CIA director General Michael Hayden stated that the CIA had waterboarded three prisoners during 2002 and 2003, namely Abu Zubaydah, Khalid Sheikh Mohammed, and Abd al-Rahim al-Nashiri. On 23 February 2008, the Justice Department revealed that its internal ethics office was investigating the department's legal approval for waterboarding of al Qaeda suspects by the CIA and was likely to make public an unclassified version of its report. On 15 October 2008, it was reported that the Bush administration had issued a pair of secret memos to the CIA in June 2003 and June 2004 explicitly endorsing waterboarding and other torture techniques against al-Qaeda suspects. The memos were granted only after "repeated requests" from the CIA, who at the time were worried that the White House would eventually try to distance themselves from the issue. Field employees in the agency believed they could easily be blamed for using the techniques without proper written permission or authority. Until this point, the Bush administration had never been concretely tied to acknowledging the torture practices. In December 2008, Robert Mueller, the Director of the FBI since 5 July 2001, had said that despite Bush Administration claims that waterboarding has "disrupted a number of attacks, maybe dozens of attacks", he does not believe that evidence obtained by the U.S. government through enhanced interrogation techniques such as waterboarding disrupted one attack. In an interview in January 2009, Dick Cheney acknowledged the use of waterboarding to interrogate suspects and said that waterboarding had been "used with great discrimination by people who know what they're doing and has produced a lot of valuable information and intelligence". On 1 July 2009, the Obama administration announced that it was delaying the scheduled release of declassified portions of a report by the CIA Inspector General in response to a civil lawsuit. The CIA report reportedly cast doubt on the effectiveness of the torture used by CIA interrogators during the Bush administration. This was based on several George W. Bush-era Justice Department memos declassified in the Spring of 2009 by the U.S. Justice Department. Abu Zubaydah