Answer
Khalid Sheikh Mohammed (also known as KSM) is a Saudi-born al-Qaeda member who was convicted of being the mastermind of the September 11 attacks. In a 2007 interrogation, KSM claimed that Aafia Siddiqui, a Pakistani neuroscientist, was allegedly working for al-Qaeda. Siddiqui was arrested in Afghanistan in 2008 and has been held at the Federal Medical Center, Carswell in Fort Worth, Texas, since 2010.