Internally displaced civilians from Fallujah flee their homes during fighting between Iraqi security forces and Islamic State group during a military operation to regain control the City, of outside Fallujah, 40 miles (65 kilometers) west of Baghdad, Iraq, Wednesday, June 1, 2016. The U.N. children's fund on Wednesday issued a stark warning to Iraqi troops and Islamic State militants in the battle for Fallujah to spare the children, the most vulnerable among tens of thousands of civilians trapped in the city west of Baghdad. (AP Photo/Anmar Khalil)