FILE - In this July 17, 2017 file photo, U.S.-backed Syrian Democratic Forces (SDF) fighters use their video camera through a hole as they film a street controlled by Islamic State militants, on the front line on the western side of Raqqa, northeast Syria. A year after it was routed from Iraq following a three-year devastating war that left Iraqi cities in ruin, the Islamic State group is fighting to hang on to its last enclave in Syria, engaging in deadly battles with U.S.-backed forces in the country's east near the Iraqi border. (AP Photo/Hussein Malla, File)
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