US NAVAL BASE AT GUANTANAMO BAY  - An Al-Qaeda magazine was discovered after being smuggled into Guantanamo prison, a senior US official said Wednesday amid a debate on new rules on mail inspections. Prison staff found an English-language copy of "Inspire" magazine which used to include such articles as how to make bombs, deputy military prosecutor Andrea Lockhart told a military tribunal hearing. She did not specify how the magazine, which is published by the Al-Qaeda in the Arabian Peninsula, was smuggled into the remote US base in southern Cuba.