A ship carrying illicit arms believed to be from Iran was intercepted last week off the southern Arabian Peninsula by a member of a U.S.-backed naval coalition and was not registered with any country, the U.S. Navy said Wednesday.

The description of the ship’s seizure conflicted in some instances with an earlier account provided by a separate Saudi-led coalition battling Yemen’s Shiite rebels, which claimed in a statement carried by the state-run Saudi Press Agency that it had foiled the smuggling attempt.

The Saudi coalition alleged that Iran was using the vessel to ship arms to the rebels, charges denied by Tehran. […]