A detention camp operated by the American military at Bagram Air Base in Afghanistan is holding prisoners for extended periods of time in windowless concrete single-person cells, according to former prisoners and human-rights workers. The site, which Pentagon officials say is used for high-value detainees, was unaffected by President Obama's executive order to end the "black sites" run by the CIA, because it is administered by the military. Afghans imprisoned there, who call the site the "black jail," tell stories of extended periods of stay, aggressive interrogations, and harsh conditions. Detainees are said to be forbidden to have contact with their families or the Red Cross, and two teenagers have come forward to allege abuse by American troops. Neither the Pentagon nor the White House would officially comment, due to the classified nature of the site.