Medical officers reported 131 civilians were killed in a Saudi-led airstrike that hit a wedding party, in what is reported to be the single deadliest incident since the start of Yemen’s civil war.

Yemeni medical officials stated at least 80 women were killed in the attack. The Saudi-led and U.S.-backed coalition supposedly struck the wedding party by accident. The attack struck a village near the town of Mokha. The region is largely populated by livestock traders and fishermen. It is reported that there is no heavy military presence in the area.

“They struck a wedding, there were only civilians there and most of them died because the Mokha hospital is closed because of supply — no drugs, no fuel, no electricity, no nothing, so the staff left,” said Hassan Boucenine, of the Geneva-based Doctors without Borders. The provincial capital of Taiz could not be used due to ongoing fighting.

Officials of the Saudi-led coalition could not be reached immediately for a comment.

The U.N. reports at least 2,355 civilians have been killed since the violence started in March. The main fight is between forces loyal to President Abdrabbuh Mansour Hadi and those allied to Zaidi Shia rebels known as Houthis, who forced Hadi out of the capital of Sanaa in February.