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Iranian state TV reported four people have been killed in the strikes, which hit a number of different oil facilities in and around Tehran.
Videos show huge flames engulfing various fuel depots, with Iranian officials confirming that facilities were damaged" by the strikes.
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It comes after US president Donald Trump hit out at Keir Starmer yet again over the UK's involvement in the Middle East war, accusing the Prime Minister of trying to "join wars after we've already won".
Trump's comments came in response to reports the UK is preparing an aircraft carrier in response to the crisis.
The Ministry of Defence said it was increasing the preparedness of HMS Prince of Wales and reducing the time it would take to set sail, but that no decisions have been taken to deploy the warship.
In a post on his Truth Social platform, the US president posted: “The United Kingdom, our once Great Ally, maybe the Greatest of them all, is finally giving serious thought to sending two aircraft carriers to the Middle East.
“That’s OK, Prime Minister Starmer, we don’t need them any longer — But we will remember. We don’t need people that join Wars after we’ve already won!”
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Trump had already hit out at Starmer as being "not Winston Churchill" following the Prime Minister's decision not to grant permission for the US to use UK bases in its initial wave of strikes.
On Saturday, the US started using British bases for "specific defensive operations" in the Middle East, with four American bombers landing in the UK.
A first 146ft B-1 Lancer arrived at RAF Fairford in Gloucestershire on Friday evening and three more followed on Saturday morning.
A Merlin helicopter is also being sent to the region to help with surveillance from the air and RAF Typhoon and F-35 jets are continuing air operations over Jordan, Qatar and Cyprus.
Questions linger over the UK’s future role in the conflict, with Deputy Prime Minister David Lammy suggesting RAF jets could legally strike Iranian missile sites being used to attack British interests in the Middle East.
Chief of the Defence Staff, Air Chief Marshal Sir Richard Knighton, has signalled that the UK could join more proactive strikes in future, saying “campaigns and conflicts evolve over time”.