Iranian boats 'attempted to impede' British Heritage
Iranian boats have unsuccessfully tried to stop an oil tanker, registered in the Isle of Man, off the country's coast.
The UK's Ministry of Defence says three Iranian vessels have attempted to block the tanker, British Heritage.
The vessels withdrew from the strait of Hormuz after a warning from a UK warship.
Last week Royal Marines detained an Iranian supertanker believed to be breaching EU sanctions.
A UK Government Spokesperson said:
"Contrary to international law, three Iranian vessels attempted to impede the passage of a commercial vessel, British Heritage, through the Strait of Hormuz.
"HMS Montrose was forced to position herself between the Iranian vessels and British Heritage and issue verbal warnings to the Iranian vessels, which then turned away.
"We are concerned by this action and continue to urge the Iranian authorities to de-escalate the situation in the region."