A man walks on the rubble 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.

Loal Red Crescent medics search to rescue 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.

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.

Local Red Crescent medics search to rescue 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.

A local Red Crescent medic tries to recover a victim's body 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.

Ambulances wait on site 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. (Photos: Xinhua)

A man stands on the rubble following airstrikes on a prison in central Dhamar province, Yemen, Spet. 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.

Local Red Crescent medics carry the body of a victim 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.

A man stands on the rubble 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.

A man stands near the body of a victim who was killed in 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.