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WASHINGTON — Confined to the basement of a CIA secret prison in Romania about a decade ago, Khalid Sheikh Mohammed, the admitted mastermind of the 9/11 terrorist attacks, asked his jailers whether he could embark on an unusual project: Would the spy agency allow Mohammed, who had earned his bachelor’s in mechanical engineering, to design a vacuum cleaner?

The agency officer in charge of the prison called CIA headquarters and a manager approved the request, a former senior CIA official told The Associated Press.

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Mohammed had endured the most brutal of the CIA’s harsh interrogation methods and had confessed to a career of atrocities. But the agency had no long-term plan for him. Someday, he might prove useful. Perhaps, he’d even stand trial one day.

And for that, he’d need to be sane.

“We didn’t want them to go nuts,” the former senior CIA official said, one of several who spoke on condition of anonymity because they were not authorized to talk about the now-shuttered CIA prisons or Mohammed’s interest in vacuums.