Five 9/11 Suspects Offer to Confess

"The fact that the judge and the prosecution and the defense clearly don't know the consequences of a guilty plea shows the sorry state of these commissions," said Diane Marie Amann, a professor at the University of California at Davis, who is observing the proceedings here for the National Institute of Military Justice.

The prospect of a guilty plea and a possible death sentence would represent a major victory for the Bush administration, which had given up on bringing Mohammed and the others to trial before leaving office Jan. 20. In the seven years since the Guantanamo Bay detention camp opened, only three people have been convicted, one as a result of a plea agreement. Two of those found guilty have been returned home. None of the "high-value" detainees transferred from CIA custody to Guantanamo in 2006 has gone to trial.

Human rights groups said the judge should hold a full hearing to determine that any pleas are free from coercion. "In light of the men's severe mistreatment, the judge should require a full and thorough factual inquiry to determine whether or not these pleas are voluntary," said Jennifer Daskal, senior counterterrorism counsel at Human Rights Watch. Daskal also said Mohammed's possible influence over the others should be explored.

Baluchi, a Pakistani accused of having been a key lieutenant of Mohammed, told a military court this year that he was an ordinary businessman who had no knowledge of the Sept. 11 plot. And at a hearing in June, Army Maj. Jon Jackson, the military lawyer for Hawsawi, said his client was subjected to "intimidation by the co-accused" during courtroom conversations.

But the defendants insisted Monday that there was no coercion. "All of these decisions are undertaken by us without any pressure or influence by Khalid Sheik," Baluchi told the judge Monday.

Mohammed, born in Kuwait to Pakistani parents, was captured in Pakistan in March 2003 and held in secret CIA prisons for three years before President Bush ordered the transfer of 14 high-value detainees to Guantanamo Bay in September 2006. Mohammed told a military hearing in March that he planned the attacks. "I was responsible for the 9/11 operation, from A to Z," Mohammed said.

On Monday, Mohammed injected humor into his statements. Citing delays in getting documents from the defendants to the judge, he asked whether the commissions are "using carrier pigeons."

In a final outburst as court ended Monday evening, Binalshibh, speaking in Arabic, said that because it is a Muslim feast day, he wanted "to send my greetings to Osama bin Laden and reaffirm my allegiance. I hope the jihad will continue and strike the heart of America with all kinds of weapons of mass destruction."

Staff writer William Branigin and staff researcher Julie Tate, both in Washington, contributed to this report.