Iran has already hit 10 tankers and has full control of the Strait of Hormuz, the Islamic Revolutionary Guard Corps announced.
An explosion occurred near a merchant ship off the coast of Oman, the Royal Navy's Maritime Trade Coordination Center reported.
The Bahraini military command reported intercepting 74 missiles and 92 drones launched from Iranian territory since February 28.
In response to the US attack, Iran has launched more than 500 missiles and 2,000 drones, and not a single Iranian ship remains in the Persian Gulf, CENTCOM reported.
Admiral Brad Cooper, head of the Central Command US command, said that 17 Iranian ships have been destroyed since the start of the operation.
More than 50,000 US troops, 200 fighter jets and two aircraft carriers are participating in the operation against Iran, and the US has struck 2,000 targets in Iran since the start of the operation, CENTCOM added.