They then turned the USA citizen, who remains unidentified, over to American forces; it's unclear where the captive is being held now.
USA officials declined to publicly identity the American or say where he surrendered or under what circumstances, but they described him as a "known enemy combatant".
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"The U.S. citizen is being legally detained by Department of Defense personnel as a known enemy combatant", he said. The State Department subsequently provided a general statement to the Daily Beast what would happen in such a situation. The Coalition defers questions pertaining to captured ISIS fighters to their relative nations' Departments of State or equivalent agencies.
A spokesperson for Operation Inherent Resolve, the United States military-led coalition leading the fight against ISIS in Iraq and Syria, did not immediately respond to Business Insider's request for comment. In March 2016, Jamal Khweis, another American Daesh terrorist was captured by the Peshmerga while he was leaving the territory then held by Daesh. He was later convicted of providing material support to ISIS and faces a minimum sentence of five years imprisonment.