Khalid Sheikh Mohammed, the man accused of being the main plotter in al-Qaida’s Sept. 11, 2001, attacks has agreed to plead guilty, the Defense Department said Wednesday.

9/11 Families leader decries plea deal with main plotter of Twin Towers attack

Khalid Sheikh Mohammed, the man accused of being the main plotter in al-Qaida’s Sept. 11, 2001, attacks has agreed to plead guilty, the Defense Department said Wednesday.