Nepal, April 30 -- The British military launched airstrikes with the United States targeting Yemen's Houthi rebels, officials said early Wednesday, their first involvement with America's new intense campaign targeting the Iranian-backed group.

The United Kingdom offered a detailed explanation of its reason to launch the strike, in a departure from the U.S., which has offered few details about the more than 800 strikes it has conducted since beginning its campaign March 15.

The campaign, called "Operation Rough Rider," has been targeting the rebels as the Trump administration negotiates with their main benefactor, Iran, over Tehran's rapidly advancing nuclear program.

UK strike hit near Yemen's capital, Sanaa

The U.K.'s Defense Ministr...