The United States is set to hand over control of a controversial prison to the Afghan government, despite a disagreement about the fate of some of the inmates.

A ceremony marking the transfer of control of the Bagram prison to Afghan authorities is scheduled to take place Monday, a move Kabul has hailed as a victory for sovereignty.

NATO spokesman Jamie Graybeal said Sunday 99 percent of the detainees have been handed over, but the coalition has halted further transfers because of concerns about the intentions of the Afghan government to fulfill the terms of a memorandum of understanding signed in March.

It was not immediately clear what those concerns are, but they seem to have emerged after a meeting Saturday between Afghan President Hamid Karzai and General John Allen, the top commander of American and NATO forces in Afghanistan.

Another issue is how quickly the U.S. must hand over recently detained Afghans. Afghan officials insisted Sunday all detainees must be handed over within 72 hours.

The fate of around 50 foreigners, mostly from Pakistan, is not covered by the agreement.