The British ambassador to Iran has been summoned to explain comments blaming the Middle Eastern nation for attacks on oil tankers in the Gulf of Oman.
British Foreign Secretary Jeremy Hunt issued a statement yesterday blaming Iran and its Islamic Revolutionary Guard Corps for the attacks, saying no other state or non-state actor could have been responsible.
Iran has denied any involvement.
Mr Hunt's comments cam after the United States released video footage that it says shows Revolutionary Guards removing an unexploded mine from the side of one of the two tankers attacked yesterday in the Gulf of Oman.
Iran's semi-official Students News Agency ISNA reported that the envoy was asked for an explanation and correction of Mr Hunt's comments.
"During the meeting with Iran's foreign ministry official, Iran strongly condemned the unfounded allegations and criticised Britain's unacceptable stance regarding the attacks in the Gulf of Oman," it said.
The attacks have raised fears of a confrontation in the vital oil shipping route of the Strait of Hormuz at a time of increased tension between Iran and the United States.
Meanwhile, British Labour leader Jeremy Corbyn has been accused of "virulent anti-Americanism" after he blamed Britain and the US for stoking conflict with Iran.
Mr Corbyn said Britain should not be fuelling a military escalation in the Gulf without "credible evidence" Iran was behind attacks on two oil tankers which dramatically heightened tensions in the region.
His comments were denounced as "pathetic" by Mr Hunt, who accused him of consistently failing to stand up for the interests of Britain and its allies.
Arriving for a Tory leadership hustings in London, he cited Mr Corbyn's reluctance to denounce Russia over the Salisbury nerve agent attack on former spy Sergei Skripal and his daughter.
"For Jeremy Corbyn it's all America's fault. This is the same man by the way who refused to condemn Putin after the Salisbury Novichok attacks," he said.
"I'm afraid this shows that Labour is in the grip of virulent anti-Americanism that will be incredibly dangerous for our country if they ever took control."