Iranian forces targeted three container ships on Wednesday, seizing two and firing on a third, global security monitors and the country's Revolutionary Guards said, the latest incidents to threaten a crucial trade route in the Middle East war.

British maritime security agency UKMTO said an Iranian gunboat fired at a container ship off the coast of Oman Wednesday, while a ship off Iran was also fired upon.

Iran's Revolutionary Guards (IRGC) said separately that their naval forces stopped two ships attempting to cross the Strait of Hormuz and directed them to Iranian waters.