A handout picture released by the Ministry of Defence shows the Panama registered Grace 1 tanker halted by Gibraltar police and a detachment of British Royal Marines in the Gibraltar Strait in the early hours of July 4, 2019. Handout / MOD / CROWN COPYRIGHT 2019 / AFP
 
Three Iranian ships attempted to “impede the passage” of a British oil tanker in Gulf waters, forcing a UK frigate to intervene, the British government said Thursday.
“Contrary to international law, three Iranian vessels attempted to impede the passage of a commercial vessel, British Heritage, through the Strait of Hormuz,” a British government statement said of the incident, which occurred on Wednesday.
READ ALSO: Pakistan Train Collision Kills Nine, Injures 66
“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,” the statement said.

…..Read directly from source