The U.S. military said Monday it released 23 Afghan and three Pakistani citizens from the U.S. Navy prison for terrorist suspects in Cuba, leaving about 610 still in detention.
They were flown back to Afghanistan and Pakistan aboard U.S. aircraft, officials said.

In a brief statement, the Pentagon did not say specifically why the 26 were let go but said each case is reviewed separately to determine whether a prisoner is of further intelligence value to the United States and whether he is believed to pose a threat to this country.

"The circumstances in which detainees are apprehended can be ambiguous, and many of them are highly skilled in concealing the truth," the statement said. "The process of evaluation and detention is not free of risk — at least one detainee has gone back to the fight" after being released.

Defense Secretary Donald H. Rumsfeld disclosed last week that one released terror suspect had rejoined the fight against the United States, but other Pentagon officials refused to elaborate.

Terms of Monday's prisoner release were not disclosed, but it appeared it would be up to the prisoners' governments to decide what to do with them.

Last week the U.S. government released five British prisoners from the detention center at Guantanamo Bay, Cuba, and a total of about 100 have been let go or transferred to other governments in recent months. The five released to the British government were later set free by London police.

The Pentagon says it has released a total of 119 prisoners from Guantanamo Bay, and 12 others have been transferred for continued detention elsewhere. Human rights groups have criticized the treatment of the Guantanamo Bay prisoners as well as their lack of access to lawyers. The Pentagon asserts that it can hold the prisoners for the duration of the war on terrorism — which some interpret as indefinitely, given the nature of the threat.