C.I.A. jailors at different times held the handgun and the drill close to the body of the detainee, Abd al Rahim al-Nashiri, threatening to use them if the prisoner was not cooperative with his interrogators, according to a government official familiar with the contents of the report.
Mr. Nashiri, believed to be the mastermind of the 2000 attack on the U.S.S. Cole, was one of two C.I.A. detainees whose interrogation sessions were videotaped. The tapes that were destroyed by C.I.A. officers in 2005, and it is unclear whether the incidents with the gun and the power drill were documented on the tapes.
In a separate episode detailed in the report, C.I.A. officers fired a gunshot in a room next to a detainee, making the prisoner believe a second detainee had been killed.
It is a violation of the federal torture statute to threaten a detainee with imminent death.
The C.I.A. declined to comment on specifics of the report, which were first reported Friday evening by Newsweek.
Paul Gimigliano, a C.I.A. spokesman, said that the “C.I.A. in no way endorsed behavior- no matter how infrequent—that went beyond the formal guidance. This has all been looked at; professionals in the Department of Justice decided if and when to pursue prosecution.”
A federal judge had ordered that the report be made public Monday in response to a Freedom of Information Act lawsuit filed by the American Civil Liberties Union, according to The Associated Press.
Newsweek’s article said the interrogation tactics outlined in the agency’s report included threatening Mr. Nashiri with a gun and a power drill during an interrogation, as well as staging a “mock execution” in a nearby room in an effort to make a detainee believe that another detainee had been killed.
Mr. Nashiri, who was captured in 2002 and is one of three detainees known to have been waterboarded, confessed to several terrorist plots during his interrogation but later said he had only done so because he had been tortured. Before leaving office, the Bush administration acknowledged that tapes of Mr. Nashiri’s interrogations, and those of another detainee, had been destroyed by the C.I.A. in 2005.
Mr. Nashiri remains in United States custody, though his trial in front of a military tribunal was frozen in February as part of a broader review by the Obama administration of legal approaches to terrorism suspects.