Ahmed Salah al-Ghamdi was named by the FBI as one of the hijackers of United Airlines flight 175 as part of the September 11, 2001 Attack. Al-Ghamdi was from the al Bahah province of Saudi Arabia, an isolated and underdeveloped area, and shared the same tribal affiliation with fellow hijackers Saeed al-Ghamdi, Hamza al-Ghamdi, and Ahmed al-Haznawi. This group is noted as being some of the more religiously observant of the hijackers. Wikipedia
The definitive Wikipedia entry for Ahmed Al-Ghamdi. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Ahmed_al-Ghamdi