Khalid Sheikh Mohammed told Guantanamo Bay interrogators the terror group would detonate the nuclear device if the al-Qaeda chief was captured or killed, according to the classified files released by the WikiLeaks website.

Sheikh Mohammed, the self-professed mastermind of the September 11, 2001 attacks on the United States, has been held at Guantanamo since 2006 and is to be tried in a military court at the US naval base on Cuba over the attacks.

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