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.

The British military launched airstrikes with the United States targeting Yemen’s Houthi rebels. The strikes Tuesday night marked their first involvement with America’s new intense campaign targeting the Iranian-backed group.

American forces have hit more than 1,000 Houthi targets in Yemen as part of a campaign that began in March to stop attacks by the militants on the shipping lanes of the Red Sea, the Pentagon said Tuesday.