WASHINGTON — A nonpartisan, independent review of interrogation and detention programs in the years after the Sept. 11, 2001, terrorist attacks concludes that “it is indisputable that the United States engaged in the practice of torture” and that the nation’s highest officials bore ultimate responsibility for it.

The sweeping, 577-page report says that while brutality has occurred in every American war, there never before had been “the kind of considered and detailed discussions that occurred after 9/11 directly involving a president and his top advisers on the wisdom, propriety and legality of inflicting pain and torment on some detainees in our custody.” The study, by an 11-member panel convened by the Constitution Project, a legal research and advocacy group, is to be released on Tuesday morning.

Debate over the coercive interrogation methods used by the administration of President George W. Bush has often broken down on largely partisan lines. The Constitution Project’s task force on detainee treatment, led by two former members of Congress with experience in the executive branch — a Republican, Asa Hutchinson, and a Democrat, James R. Jones — seeks to produce a stronger national consensus on the torture question.

While the task force did not have access to classified records, it is the most ambitious independent attempt to date to assess the detention and interrogation programs. A separate 6,000-page report on the Central Intelligence Agency’s record by the Senate Intelligence Committee, based exclusively on agency records, rather than interviews, remains classified.

“As long as the debate continues, so too does the possibility that the United States could again engage in torture,” the report says.

The use of torture, the report concludes, has “no justification” and “damaged the standing of our nation, reduced our capacity to convey moral censure when necessary and potentially increased the danger to U.S. military personnel taken captive.” The task force found “no firm or persuasive evidence” that these interrogation methods produced valuable information that could not have been obtained by other means. While “a person subjected to torture might well divulge useful information,” much of the information obtained by force was not reliable, the report says.

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