The U.S-backed, Saudi-led coalition faces increasing condemnation for airstrikes the United Nations says are responsible for the majority of civilian deaths in Yemen’s ongoing conflict. Nearly 6,000 people have died and at least 70 health clinics have been bombed since the Saudi-led bombing began in March. Speaking at the U.N. Security Council, U.N. human rights chief Zeid Ra’ad al-Hussein said a disproportionate amount of attacks on civilians are carried out by the U.S.-backed Saudi coalition.

Zeid Ra’ad al-Hussein: “I have observed, with extreme concern, the continuation of heavy shelling from the ground and the air in areas with a high concentration of civilians, as well as the perpetuation of the destruction of civilian infrastructure, in particular hospitals and schools, by all parties to the conflict, although a disproportionate amount appeared to be the result of airstrikes carried out by coalition forces.”

U.S. Ambassador Samantha Power told the Security Council the Obama administration has urged the Saudis to abide by international law. But the U.S. continues to back the airstrikes with intelligence and weapons, including a billion-dollar deal to restock Saudi Arabia’s air force arsenal, which was depleted by its bombing campaign in Yemen. The sale included thousands of air-to-ground munitions and “general purpose” bombs. The United States has also reportedly sold internationally banned cluster munitions to Saudi Arabia now being used in Yemen. This comes as a new report by the United Nations and the International Office of Migration says more than 2.5 million people are internally displaced inside Yemen.