WASHINGTON (CNN) -- U.S. Attorney General Michael Mukasey arrived Wednesday for his first look at the controversial military prison complex at Guantanamo Bay, Cuba.
U.S. Attorney General Michael Mukasey was set to meet with officials involved in military commission proceedings.
Mukasey's visit was expected to last about five hours. His trip had not been announced in advance.
"The visit provided him with the opportunity to see firsthand the state-of-the-art detention facility at the station," said Justice Department spokesman Peter Carr.
Mukasey is scheduled to meet with military personnel and other officials involved in military commission proceedings.
Justice Department prosecutors and FBI agents have been involved in the proceedings related to "high value" detainees who were moved to Guantanamo Bay.
Military officials announced this month that six detainees will go before military commissions and could face the death penalty if it is judged they were involved in the September 11, 2001, attacks. Alleged 9/11 mastermind Khalid Shaikh Mohammed is among the six.
About 275 foreign nationals are being held at Guantanamo, according to the Defense Department. The detainees' attorneys repeatedly have complained that their clients are being denied due process.
The U.S. Supreme Court has twice expressed reservations about how the government handles detainees at the U.S. naval base.
In 2006, the high court ruled the Bush administration's use of military tribunals was unconstitutional because the system did not allow terror suspects to challenge their detention.
Congress last year passed the Military Commissions Act, which provided terror suspects with a limited right to appeal convictions and reduced the jurisdiction of federal courts.
According to the act, the detainees will be allowed to see all evidence against them, call defense witnesses and cross-examine prosecution witnesses.
They also will have the right to appeal a guilty verdict, potentially through a civilian appeals court and perhaps the Supreme Court, according to the act. E-mail to a friend 
CNN's Terry Frieden contributed to this report.
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