Yemen’s Houthi group said late Thursday that US warplanes launched 13 airstrikes targeting the country’s northern provinces of Sanaa, Saada and Al-Jawf. The Houthi-affiliated Al-Masirah TV channel reported that “US aggression aircraft launched an airstrike on Hamdan district in Sanaa province.”

The U.S. is conducting strikes on Yemen from its two aircraft carriers in the region — the USS Harry S. Truman in the Red Sea and the USS Carl Vinson in the Arabian Sea, targeting the Houthis because of the group’s attacks on shipping in the Red Sea, a crucial global trade route, and on Israel.

Britain’s military launched airstrikes against Houthi targets in Yemen on Tuesday with US forces, its defense ministry said – the first public acknowledgment of a joint operation since the Trump administration escalated the US campaign against the militant group.