Three men accused of plotting the 9/11 attacks, including alleged mastermind Khalid Sheikh Mohammed, have entered a plea agreement with the military, officials said Wednesday.

Mohammed, Walid Muhammad Salih Mubarak Bin ‘Attash and Mustafa Ahmed Adam al Hawsawi will plead guilty to some charges as early as next week at Guantanamo Bay, the Office of Military Commissions said.

The terms of the agreement are not available, the Pentagon said in a statement.

They are expected to plead guilty to lesser charges that could spare them the death penalty.

Mohammed and several other defendants, including the two others included the plea agreement, were initially charged and arraigned in 2008 in connection with their alleged role in the attack, according to the statement.

Mohammed was captured in Pakistan in 2003 and held with other al Qaeda detainees at Guantanamo Bay.