US prosecutors have reached a deal with 9/11 mastermind Khalid Sheikh Mohammed, the Pentagon said Wednesday, reportedly involving a guilty plea in exchange for avoiding a death penalty trial. The agreements with Mohammed and two other accused moves their long-running cases toward resolution. These have been bogged down in pre-trial maneuverings for years while the defendants remained held at the Guantanamo Bay military base in Cuba. A Pentagon statement said no details of the deal would be immediately made public at this time, but the New York Times reported that Mohammed, Walid bin Attash and…