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AL QAYYARAH, IRAQ - NOVEMBER 09: A firefighter works to extinguish an oil well set on fire by fleeing ISIS members on November 9, 2016 in Al Qayyarah, Iraq. Many families have begun returning to their homes in recently liberated towns south of Mosul. Oil wells in the area that were set on fire by ISIS continue to burn blanketing the area in think clouds of smoke and oil. (Photo by Chris McGrath/Getty Images)

AL QAYYARAH, IRAQ - NOVEMBER 09:  A firefighter works to extinguish an oil well set on fire by fleeing ISIS members on November 9, 2016 in Al Qayyarah, Iraq. Many families have begun returning to their homes in recently liberated towns south of Mosul. Oil wells in the area that were set on fire by ISIS continue to burn blanketing the area in think clouds of smoke and oil.  (Photo by Chris McGrath/Getty Images)