The United Nations has condemned an airstrike on a busy market that killed at least 17 people earlier this week in northern Yemen, a region which has been under control of Yemen’s Iran-backed rebels known as Houthis. The office of the U.N. human rights coordinator in Yemen did not say who was behind the attack but a Saudi-led coalition has been waging war against the Houthis since 2015, trying to restore the internationally recognized government to power. Thousands of Yemeni civilians have died in airstrikes.