WASHINGTON — The United States and Britain launched strikes against 36 Houthi targets in Yemen on Saturday, in the second day of major U.S. operations against Iran-linked groups following a deadly attack on American troops last weekend. The Yemen strikes are running parallel to an unfolding U.S. campaign of military retaliation over the killing of three American soldiers in a drone strike by Iran-backed militants on an outpost in Jordan. The Houthis, who control the most populous parts of Yemen, say their attacks are in solidarity with Palestinians as Israel strikes Gaza. The U.S. military’s Central Command said that beyond missile capabilities, the strikes targeted drone storage and operations sites, radars and helicopters. The other three attacks targeted Jabal Al-Jada’ in Al-Lahiya District and the Al-Salif District in Al-Hudaydah Governorate.