A bulldozer removes the rubble to search for victims following airstrikes on a prison in central Dhamar province, Yemen, Sept. 1, 2019. At least 50 prisoners of war were killed when the Saudi-led coalition launched a series of airstrikes overnight on a prison in Yemen's central province of Dhamar, the Houthi-controlled health ministry said in a statement early Sunday morning. (Photo by Mohammed Mohammed/Xinhua)