UK-flagged supertanker Pacific Voyager which halted in the Gulf on Saturday is "safe and well", a British official told Reuters. A Revolutionary Guards commander on Friday had threatened to seize a British ship in retaliation for the capture by Royal Marines of Iranian supertanker Grace 1 in Gibraltar. The Pacific Voyager stopped as part of a routine procedure to adjust its arrival time at its next port, an official at UK Maritime Trade Operations (UKMTO) told Reuters. The UKMTO, which coordinates shipping in the Gulf, had been in contact with the tanker, the official said. On Saturday an Iranian cleric said Britain should be "scared" about Tehrans possible retaliation for the seizure of the Grace 1, the Fars semi-official news agency reported. "I am openly saying that Britain should be scared of Irans retaliatory measures over the illegal seizure of the Iranian oil tanker," said Mohammad Ali Mousavi Jazayeri, a member of the Assembly of Experts clerical body. Tensions are high in the Gulf following last months attacks on vessels near the Strait of Hormuz and Irans downing of a US drone.