Reuters reports some of them have been locked up for a dozen years. Some are suspected fighters from Yemen, Russia or Pakistan, arrested by U.S. forces in Afghanistan or elsewhere. Several have been linked to al-Qaeda. As the U.S.-led war in Afghanistan winds down, the White House will soon provide Congress a dossier on about 50 non-Afghan detainees in a U.S. military prison north of Kabul. Their uncertain fate presents sensitive security and legal problems for the Obama administration in an echo of Guantanamo Bay. As with Guantanamo, some prisoners at the Parwan detention center are considered by the U.S. government too dangerous to be freed. Others have unclear links to the Afghan conflict, including a Yemeni arrested in Bangkok and moved to the prison.