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The Supreme Court ruled in 2010 that the Canadian government’s participation in the “then-illegal military regime” at Guantanamo breached Khadr’s guarantee of fundamental justice under the Charter of Rights and Freedoms.

Khadr, now 30, says his captors repeatedly threatened him with rape, isolated him and on one occasion used him as a human mop to wipe up urine.

Records show they deprived Khadr of sleep by moving him from cell to cell, a practice known as the “frequent flyer program” designed to break down resistance to interrogation.

In February and September 2003, officials from the Canadian Security Intelligence Service and Foreign Affairs questioned Khadr at Guantanamo and shared the results of their interrogations with the Americans.

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A Foreign Affairs official interviewed him again in March 2004, knowing he had been subjected to the “frequent flyer” treatment. This time, Khadr refused to answer questions.

The Supreme Court said the interrogations offended “the most basic Canadian standards” about the treatment of young detainees.

Khadr was transferred to a Canadian prison in 2012.

The federal apology, delivered Friday in a terse statement, did not mention financial compensation, but followed reports of a controversial $10.5-million settlement of Khadr’s long-standing lawsuit.

“On behalf of the government of Canada, we wish to apologize to Mr. Khadr for any role Canadian officials may have played in relation to his ordeal abroad and any resulting harm,” the statement reads.