Strait of Hormuz
HMS Duncan has joined HMS Montrose to help British-flagged ships.
The government is looking at its options as an audio recording emerges of the moments HMS Montrose was seized in the Strait of Hormuz.
Oil and gas prices will be affected if tensions in the area continue, according to a leading authority on British shipping.
Iran’s Revolutionary Guard said on Friday it has seized two oil tankers - one British-flagged and the other British owned.
Iran’s Revolutionary Guard corps made the claim on Friday evening.
An Iranian official suggested the US shot down one of their own drones by mistake
It's the latest escalation in a tense standoff between Washington and Tehran.
Three Iranian vessels tried to block the passage of an oil tanker through the Strait of Hormuz, but withdrew after warnings from a British warship, the UK government said. The stand off followed a warning by Donald Trump that US sanctions on Iran would soon be "substantially" increased as part of his drive to curb Iran's nuclear activities and regional behaviour.
Foreign Secretary Jeremy Hunt said he will unveil diplomatic and economic measures on Monday, but what sparked the incident?
Iran shoots down US drown amid mounting tension since Trump imposed sanctions over the country's nuclear programme.