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An armed unmanned surface vessel launched from Houthi-controlled Yemen got within a "couple of miles" of U.S. Navy and commercial vessels in the Red Sea before detonating on Thursday, just hours after the White House and a host of partner nations issued a final warning to the Iran-backed militia group to cease the attacks or face potential military action.

Vice Admiral Brad Cooper, the head of U.S. Navy operations in the Middle East, said it was the first time the Houthis had used an unmanned surface vessel, or USV, since their harassment of commercial ships in the Red Sea began after the outbreak of the Israel-Hamas war. They have, however, used them in years past.