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.
Tracking data showed the Stena Impero was in the same area where a United Arab Emirates-based vessel was detained on Sunday and where a British vessel, the British Heritage, was blocked by Iranian forces earlier this month.
Cobra - Meeting - Officials - Foreign - Office
A Cobra meeting was held between officials from the Foreign Office, Ministry of Defence and other Government departments on Friday night to determine the UK's response.
A Whitehall source told the Telegraph of the Stena Impero: "It does look like it has been hijacked. Ships don't follow that pattern. It turned right and straight into Iranian waters. It is really concerning that this has happened.
Face - Revolutionary - Guard - Ship - Events
"It looks on the face of it as though the Iranian Revolutionary Guard have boarded and taken a UK-flagged ship. It appears to be linked to events around the Grace 1 tanker."
British authorities seized the Iranian Grace 1 supertanker off the coast of Gibraltar on July 4, on suspicion it was carrying crude to Syria in violation of European Union sanctions.
Fate - Tanker - Centre - Tensions - UK
The fate of the tanker has been at the centre of escalating tensions between the UK and Iran and seen as a pawn in the standoff between the Islamic Republic and the West.
Jeremy Hunt, Foreign Secretary, had hinted last Saturday that the UK would release the ship if Iran promised its cargo would not go to the Syrian regime. He said talks between him and counterpart Mohammad Javad Zarif had been productive.
Court - Gibraltar - Friday - Days - Detention
However, a court in Gibraltar on Friday extended for 30 days the detention of the vessel, which was carrying two million barrels of oil.
Revolutionary Guards have been threatening retaliation for its impounding and the move would...
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