He was held on an immigration charge while the FBI and Scotland Yard investigated him. His phone calls, bank accounts, and associations were researched, but the FBI says they found no connections to terrorism. When interrogators asked Khalid Sheikh Mohammed, the mastermind of the 9/11 attacks, whether he knew al-Bayoumi, he said that he did not.[19] He was released, and went back to studying at Aston,[20] and later moved to Saudi Arabia.