FILE - In this March 9, 2017 file photo, a large cloud of smoke rises during fighting between Iraqi security forces and Islamic State militants as civilians walk toward Iraqi security forces after fleeing their homes on the western side of Mosul, Iraq. The U.S. is deepening its involvement in the war against the Islamic State group after an unprecedented American airlift of Arab and Kurdish fighters to the front lines in northern Syria, supported by the first use of U.S. attack helicopters and artillery in the country. (AP Photo/Khalid Mohammed, File)
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