After ten months , U.S. Border and Immigration Authorities took a fingerprint sample and discovered that he was the same person who had tried to enter the United States just before the September 11 attacks . Seizing the airport 's CCTV surveillance recordings , the FBI claimed they were able to identify the car of Mohamed Atta at the airport , believed to be there to pick up Qahtani . Another military account stated that Qahtani was identified as someone who had previously been turned away due to visa problems – by fingerprints " taken in Southwest Asia "
September 11 attacks
September 11 attacks
Mohammed al-Qahtani