Guards stand at a checkpoint near burning oil fields in Qayara, south of Mosul, Iraq, Tuesday, November 22, 2016. For months, residents of the Iraqi town of Qayara have lived in the darkness from a cloud of toxic fumes released by oil fields lit by retreating Islamic State fighters. (Photo by Felipe Dana/AP Photo)





Children play in Qayara, south of Mosul, Iraq, Tuesday, November 22, 2016. (Photo by Felipe Dana/AP Photo)





Oil workers try to extinguish burning oil fields in Qayara, south of Mosul, Iraq, Tuesday, November 22, 2016. (Photo by Felipe Dana/AP Photo)





Children play in Qayara, south of Mosul, Iraq, Tuesday, November 22, 2016. (Photo by Felipe Dana/AP Photo)





An Iraqi family sits inside a car as they wait at a checkpoint near Qayara, south of Mosul, Iraq, Sunday, November 20, 2016. Iraqi troops on Sunday fortified their positions in Mosul neighborhoods retaken from the Islamic State group as their advance toward the city center was slowed by sniper fire and suicide bombings, as well as concern over the safety of civilians. (Photo by Felipe Dana/AP Photo)





A boy plays with a homemade toy gun in Qayara, south of Mosul, Iraq, Tuesday, November 22, 2016. (Photo by Felipe Dana/AP Photo)





An oil worker walks next to burning oil fields in Qayara, south of Mosul, Iraq, Tuesday, November 22, 2016. (Photo by Felipe Dana/AP Photo)





People ride on a tractor in Qayara, south of Mosul, Iraq, Tuesday, November 22, 2016. (Photo by Felipe Dana/AP Photo)





Children stand among smoke from burning oil fields in Qayara, south of Mosul, Iraq, Tuesday, November 22, 2016. (Photo by Felipe Dana/AP Photo)





A boy poses for a photo as he plays with a homemade toy gun in Qayara, south of Mosul, Iraq, Tuesday, November 22, 2016. (Photo by Felipe Dana/AP Photo)





Children walk among smoke from burning oil fields in Qayara, south of Mosul, Iraq, Tuesday, November 22, 2016. (Photo by Felipe Dana/AP Photo)





A tree stands among smoke from burning oil fields in Qayara, south of Mosul, Iraq, Tuesday, November 22, 2016. (Photo by Felipe Dana/AP Photo)