US reaches plea deal with alleged 9/11 mastermind Khalid Sheikh Mohammed

Three of the five 9/11 defendants at Guantanamo Bay, including alleged mastermind Khalid Sheikh Mohammed, have reached a plea agreement with prosecutors, the Pentagon announced on Wednesday. ––– Subscribe to ABC News on YouTube: Watch 24/7 coverage of breaking news and live events on ABC News Live: Watch full episodes of World News Tonight with David Muir here: Read ABC News reports online: ABC News Digital is your daily source of breaking national and world news, exclusive interviews and 24/7 live streaming coverage. ABC News is the home to the #1 evening newscast “World News Tonight” with David Muir, “Good Morning America,” “20/20,” “Nightline,” “This Week” with George Stephanopoulos, “ABC News Live Prime” with Linsey Davis, plus the daily news podcast “Start