The Pentagon has charged six detainees at Guantanamo Bay with murder and war crimes in connection with the Sept. 11 terror attacks said Brig. Gen. Thomas W. Hartmann,the legal adviser to the U.S. military tribunal system.Khalid Sheik Mohammed, the suspected mastermind of the attacks, in which hijacked planes were flown into buildings in New York and Washington, Mohammed al-Qahtani, the man officials have labeled the 20th hijacker; Ramzi Binalshibh, said to have been the main intermediary between the hijackers and leaders of Al Qaeda; Ali Abd al-Aziz Ali, known as Ammar al-Baluchi, a nephew of Khalid Sheikh Mohammed, who has been identified as Mohammed’s lieutenant for the 2001 operation; al-Baluchi’s assistant, Mustafa Ahmad al-Hawsawi; and Waleed bin Attash, a detainee known as Khallad, who investigators say selected and trained some of the hijackers.