Khalid Sheikh Mohammed
In 1997, Osama bin Laden said during an interview that he did not know Yousef but claimed to know Khalid Sheikh Mohammed, who is the mastermind behind the September 11, 2001 attacks and Yousef's uncle. According to the 9/11 Commission, Khalid Sheikh Mohammed said under interrogation that "Yousef was not a member of al Qaeda and that Yousef never met Bin Laden."
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