The US blockade of Iranian ports appeared to be impacting the movement of ships in the Gulf on Tuesday, with tracking data showing that several tankers transiting the Strait of Hormuz had either stopped or turned around.
Several cargo ships that had come from Iranian ports, including at least two sanctioned tankers, attempted to cross the narrow waterway in the hours after the embargo came into effect on Monday, but none have gone further than the mouth of the Gulf of Oman.
The US military said on Monday that no ships had passed through its blockade of Iranian ports in its first 24 hours, and that six vessels had turned around when ordered to do so.