The five men accused of plotting the September 11, 2001 attacks are expected to return to court Monday in the next series of pretrial hearings in a military commission courtroom at the US naval base in Guantanamo Bay, Cuba, dpa reported.
Pakistan-born Khalid Sheikh Mohammed, the self-proclaimed mastermind of the attacks from Pakistan, has been in captivity since 2003. Mohammed and the other four - Walid bin Attash, Ali Abdul Aziz Ali, Mustafa al-Hawsawi and Ramzi Binalshibh - face the death penalty if convicted.
Binalshibh of Yemen was part of the Hamburg, Germany, terrorist cell that included Egyptian Mohammed Atta, a lead hijacker in the group of 19 that commandeered four passenger planes and crashed them into New York, Washington and Pennsylvania.
As in past hearings, procedural issues are expected to dominate the five days in court. The actual trial is not expected to begin until sometime in 2014.
The defendants have boycotted some of the past proceedings.
The charges against them include conspiracy, attacking civilians, murder in violation of the law of war, hijacking and terrorism.
The government says they helped train and finance the 19 men who hijacked the four planes that were crashed into symbolic centres of American power - the World Trade Center and the Pentagon - killing nearly 3,000 people.
One plane crashed in rural Shanksville, Pennsylvania, after passengers moved against the hijackers, preventing it from hitting a second presumed target in the nation's capital.
About 100 of Guantanmo's remaining 166 prisoners have been on a months-long hunger strike over their indefinite detentions.
The military said in July that 46 of the strikers were malnourished enough to require forced feedings.