Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. IS Detainees in Syria a 'Ticking Time Bomb,' State Department Official Says Reuters Some 10,000 Islamic State detainees held in prisons in northeastern Syria present a major security risk, a senior State Department official said Tuesday, urging countries to take back their citizens who joined the group and were detained. "It's a ticking time bomb to simply have the better part of 10,000 detainees, many of them foreign fighters," the official told reporters in a conference call. Islamic State has lost almost all of its territory in Iraq and Syria. Its former leader Abu Bakr al-Baghdadi was killed in a U.S. raid last month, but IS remains a security threat in Syria and beyond. Allies have been worried that Islamic State militants could escape as a result of Turkey's assault against Syrian Kurdish militia fighters who have been holding thousands of the group's fighters and tens of thousands of their family members. .