WASHINGTON (AP) — The U.S. military has stopped another merchant vessel trying to break through the American blockade of Iranian ports, a U.S. official with knowledge of the situation told The Associated Press on Saturday. The Gambia-flagged bulk carrier Lian Star ignored multiple warnings from U.S. forces overnight as it tried to enter an Iranian port, the official, who spoke on condition of anonymity to discuss military operations, said. The ship was disabled by U.S. aircraft in the Gulf of