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In “Kill or Capture: The War on Terror and the Soul of the Obama Presidency,” Daniel Klaidman says Mohammed was caught on tape boasting to other detainees about the attacks. According to the book, Mohammed mentioned specific pieces of evidence, documents and computer files that could be tied directly to him to other detainees at the military detention facility at U.S. Naval Base Guantanamo Bay, Cuba.

The statements, voluntarily uttered, would allow the government to get around the problem of using statements made during interrogations that defense lawyers would try to exclude from trial as tainted by torture.

Mohammed’s conversations “were intercepted by military spies and mined for intelligence,” Mr. Klaidman writes.

It is unclear whether the military has changed its mind and now plans to use the recordings at his upcoming military commission trial. On Wednesday, a Pentagon spokesman, Army Lt. Col. Todd Breasseale, declined to comment.

• From wire dispatches and staff reports