Khalid Saeed Ahmad al Zahrani is suspected as possibly the 20th hijacker. He traveled to Afghanistan illegally after being prohibited by Saudi authorities from leaving Saudi Arabia.After being assigned to a mission in the U.S., he secretly reentered the Kingdom but failed in an attempt to have his name removed from the list of prohibited travelers so that he could obtain a U.S. visa. See Intelligence reports, interrogations of detainee, Apr. 20, 2002; Oct. 4, 2002; Apr. 3, 2003.