SANAA, Yemen (AP) The Saudi-led coalition fighting in Yemen staged multiple airstrikes on a detention center operated by the Houthi rebels in the southwestern province of Dhamar, killing at least 100 people and wounding dozens more Sunday, officials and the rebels health ministry said.

Franz Rauchenstein, the head of the Red Cross delegation in Yemen, suggested that the death toll could be higher after visiting the site of the attack, saying relatively few detainees survived. A Red Cross statement said the detention center held around 170 detainees. It said 40 of those were being treated for injuries and the rest were presumed dead.

Witnessing this massive damage, seeing the bodies lying among the rubble, was a real shock. Anger and sadness were natural reactions, Rauchenstein said.

The attack was the deadliest so far this year by the coalition, according to the Yemen Data Project, a database tracking the war. The coalition has faced international criticism for airstrikes that have hit schools, hospitals and wedding parties, killing thousands of Yemeni civilians.