But the jihadist Islamic State said it still controls the dam, and that fighting is ongoing. If the Kurdish claim is confirmed, it would deal the militants their first major reversal since June.
Members of the National Guard have arrived in the St. Louis area, one day after the suburb of Ferguson saw new violence at a protest over an unarmed teenager killed by police.
Protesters attacked a quarantine center holding the patients, forcing at least 20 to leave the facility. Getty's John Moore says the "mob ... pulled people out of the isolation ward."