Description:A week of pretrial hearings began on Monday (January 28) in the war crimes tribunal for five alleged 9/11 conspirators at the Guantanamo Bay U.S. Naval Base in Cuba. The defendants include Khalid Sheikh Mohammed, the accused mastermind of the hijacked plane attacks that killed 2,976 people on September 11, 2001, and four others accused of training and aiding the hijackers: Mohammed's nephew, Ali Abdul-Aziz Ali, Yemenis Walid bin Attash and Ramzi Binalshibh and Saudi Mustafa al Hawsawi. More th(1:53)