KABUL, Afghanistan - Afghanistan President Hamid Karzai is demanding that the U.S. detention centre at Bagram Air Base be handed over to Afghan control within a month.

A presidential statement said Thursday that keeping Afghan citizens there without trial violates the country's constitution, as well as international human rights conventions.

The prison, inside the sprawling U.S. base at Bagram north of Kabul, abuts a a well-known public detention centre known as Parwan, which is run jointly by Afghan authorities and the U.S. military.

The U.S.-led NATO coalition is gradually handing over responsibility for security to the Afghan police and army. The process is due to be completed in 2014, when most foreign troops are scheduled to be withdrawn from Afghanistan.