United States prison operations in the Iraq War
During the Iraq War, occupying U.S. forces set up camps and converted existing prisons in Iraq to detain POWs, suspected terrorists, and insurgents who were opposed to the American occupation. While reports vary, from 2003 onwards U.S. troops stationed in Iraq detained more than 100,000 prisoners in the American-held detention complexes.
Source: Wikipedia — United States prison operations in the Iraq War (CC BY-SA 4.0)