An anonymous reader writes: According to Yahoo News, the CIA inspector general's office "mistakenly" destroyed its only copy of a mammoth Senate torture report at the same time lawyers for the Justice Department were assuring a federal judge that copies of the document were being preserved. Agency officials described the deletion of the document to Senate investigators as an "inadvertent" foul-up by the inspector general. "CIA inspector general officials deleted an uploaded computer file with the report and then accidentally destroyed a disk that also contained the document, filled with thousands of secret files about the CIA's use of 'enhanced' interrogation methods," reports Yahoo News. The Senate Intelligence Committee and Justice Department knew about the incident last summer, sources said. However, the destruction of a copy of the sensitive report was never made public, nor was it reported to the federal judge at the time who was overseeing a lawsuit seeking access to the still classified document under the Freedom of Information Act. Despite this incident, a CIA spokesperson has said another unopened computer disk with the full report is still locked in a vault at agency headquarters. "I can assure you that the CIA has retained a copy," wrote Dean Boyd, the agency's chief of public affairs, in an email. Feinstein is calling for the CIA inspector general to obtain a new copy of the report to replace the one that disappeared. A 500-page summary was released in 2014, and concluded that the CIA misled Americans on the effectiveness of "enhanced interrogation." Specifically, the interrogations were poorly managed and unreliable.