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 American strikes come amid an intensifying, parallel drive by U.S. ally Israel, which has launched its own series of airstrikes on Houthi targets in response to recent missile and drone attacks on Israel that, while mostly intercepted, have struck some civilian sites and have sent millions seeking regular refuge in bomb shelters.

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.