Michael Isikoff reports: The CIA inspector general’s office — the spy agency’s internal watchdog — has acknowledged it “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, Yahoo News has learned.

While another copy of the report exists elsewhere at the CIA, the erasure of the controversial document by the office charged with policing agency conduct has alarmed the U.S. senator who oversaw the torture investigation and reignited a behind-the-scenes battle over whether the full unabridged report should ever be released, according to multiple intelligence community sources familiar with the incident.

The deletion of the document has been portrayed by agency officials to Senate investigators as an “inadvertent” foul-up by the inspector general. In what one intelligence community source described as a series of errors straight “out of the Keystone Cops,” 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. [Continue reading…]