A board reviewing the status of prisoners at Guantanamo Bay has decided against releasing a Saudi who U.S. authorities believe narrowly avoided becoming one of the hijackers in the Sept. 11, 2001, terrorist attack. Lawyers for prisoner Mohammed al-Qahtani asked the Periodic Review Board last month to send the prisoner to a rehabilitation center in Saudi Arabia for treatment of severe mental illness. The board, made up of representatives of six government agencies, turned down the request in a statement released Wednesday. …