Soldiers use drones to check on Islamic State positions during the joint operation to free Badush district, near Mosul, Iraq, on March 20, 2017. Iraqi government forces battling Islamic State militants retook control of more areas in the old city center of western Mosul, while an international airstrike on IS positions killed six leaders of the extremist group in the city, the Iraqi military said on March 19. (Xinhua/Asmaa Waguih)
