The mastermind of the 9/11 attacks warned that al-Qaeda has hidden a nuclear bomb in Europe which will unleash a "nuclear hellstorm" if Osama bin Laden is captured, leaked files revealed.
The terror group also planned to make a 9/11 style attack on London's Heathrow airport by crashing a hijacked airliner into one of the terminals, the files showed.
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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