A second oil tanker, the British-operated, Liberian-flagged Mesdar, turned sharply north towards Iran's coast on Friday afternoon after passing westward through the Strait of Hormuz into the Gulf, according to Refinitiv tracking data.
The turn took place at about 1600 GMT, the data showed, about 40 minutes after a similar course shift by the Stena Impero tanker that Iran's Revolutionary Guards said they had captured.
There was no immediate word from the Guards about the second tanker or from the operator of the second tanker on what had prompted the change in direction along the vital international oil shipping route.
Reporting by Frances Kerry