The Biden administration directed new airstrikes on Houthi targets in Yemen on Tuesday, as the United States and its ally Israel struggle to halt a campaign of regional assaults by the Iranian-backed militant group.

Israel’s military says it intercepted a missile fired toward the country by Yemen’s Houthi rebels. The attack set off sirens late Monday in central areas of Israel, including Tel Aviv.

The head of the World Health Organization said he was about to board a flight in the Yemeni capital when the airport came under bombardment.