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An Iraqi helicopter was shot down by ISIS militants late Friday, killing both pilots aboard. The attack is raising concerns about ISIS’s ability to take down aircraft amid ongoing U.S.-led coalition airstrikes. The helicopter was attacked in the Shiite city of Samarra and was brought down by a shoulder-fired rocket launcher. ISIS also brought down two other Iraqi military helicopters in October, suggesting they may have acquired ground-to-air missiles after overrunning Iraqi and Syrian army bases earlier this year.