Karzai demands control of Bagram prison President Hamid Karzai on Thursday called for the US to hand over its biggest military prison in Afghanistan within one month, despite repeated warnings that Afghan institutions are woefully unprepared to detain or try suspected terrorists. Mr Karzai claimed that Afghan government investigators found violations of the Afghan constitution and international human rights conventions at the prison, which houses about 2,600 inmates near Bagram airfield. He did not provide details about the alleged violations, but said in a statement that they constituted a "breach of Afghan sovereignty." The transfer of the prison, called the Parwan detention centre, and its burgeoning population of detainees is regarded by both Afghans and the US as a critical marker of the war's endgame - a sign that Afghan officials are ready to inherit institutions essential to the nation's future. US officials said two years ago that they expected the prison to be transferred in early 2012. Mr Karzai interpreted that timeline as being firm, but US officials point to a caveat in the document: that it was subject to "demonstrated capacity." The country's judicial system has remained weak, US officials say, raising concerns that Afghans would be unable to prosecute or detain the large number of insurgents captured by Nato forces and allowing dangerous Taliban fighters to slip through the cracks. Officials told the Washington Post last July that that the US would be unable to relinquish authority at the prison until at least 2014, just as the last foreign troops are scheduled to leave Afghanistan. "At this point, the Afghans don't have the legal framework or the capacity to deal with violence being inflicted on the country by the insurgency," one US official said on condition of anonymity at the time. On Thursday, US State Department spokeswoman Victoria Nuland said in response to Mr Karzai's comments: "We're going to continue to work with the Afghan government to implement the transition that we have both agreed needs to happen of detention operations in Afghanistan. We need to do this in a manner that is maximally responsible. She said she could not comment further on the timeline for the transfer. The existence of the US military prison, about 30 miles north of Kabul, has long been seen by Afghans as a sign of imperial overreach and it has often been singled out for criticism by Mr Karzai. The US military has detained suspected insurgents at facilities in the area for about a decade. Most have been kept without trial, with less than a third of the prison's detainees having been handed over for prosecution to an Afghan-run court. However, the number of Afghan judges and guards has risen steadily. As of July, the Afghan-run court at the prison was hearing about 50 cases a month. Mr Karzai has made bold claims in the name of Afghan sovereignty and the insistence on a rapid transfer of prison control ranks among the boldest. But while he craves a more active role for Afghan institutions, he has also made repeated appeals for continued international support for the country beyond 2014. Afghan defence officials argue that the Taliban has successfully used the prison as propaganda to galvanise insurgents, drawing on reports of harsh interrogation methods. An investigation into the deaths of two detainees in 2002 uncovered evidence of prisoners being chained to the ceiling by their wrists, and being severely beaten by guards. The Pentagon facility was rebuilt in 2009 and the inmate review process was overhauled to increase transparency, officials said. Jason Ukman and Julie Tate contributed to this story. By agreement with the Washington Post