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 . " Some authors , however , have made note of a stronger link between Yousef and bin Laden
September 11 , 2001 attacks
September 11 attacks
Ramzi Yousef