British Prime Minister Boris Johnson has accused Tehran of being behind attacks on Saudi oil installations, as he prepared to meet with Iran's president and US President Donald Trump.
Speaking to reporters en route to the UN General Assembly in New York, Johnson said there was a "very high degree of probability" that Iran was responsible for the September 14 attacks.
The United States and Saudi Arabia have, to various degrees, blamed Tehran for the air attacks on the kingdom's Abqaiq plant and the Khurais oil field.
Iran denies responsibility, and the attacks have been claimed by Iranian-back Huthi rebels in Yemen.
"I can tell you that the UK is attributing responsibility with a very high degree of probability to Iran for the Aramco attacks," Johnson said, according to Britain's Press Association news agency.
"We think it very likely indeed that Iran was indeed responsible for using both UAVs (unmanned aerial vehicles), both drones and cruise missiles.
"Clearly the difficulty is, how do we organise a global response? What is the way forward?
"And we will be working with our American friends and our European friends to construct a response that tries to de-escalate tensions in the Gulf region."
Johnson will hold a joint meeting with French President Emmanuel Macron and German Chancellor Angela Merkel in New York later Monday to discuss the issue.
He will meet Trump on Tuesday, before talks with Iran's President Hassan Rouhani.
"Clearly if we are asked either by the Saudis or the Americans to have a role then we would consider in what way we could be useful," he said.
In response, Iranian foreign ministry spokesman Abbas Mousavi called on London to ends arms sales to Saudi Arabia, which has been involved in a five-year bombing campaign in neighbouring Yemen.
"Britain must stop selling deadly weapons to Saudi Arabia, which is the demand of all the people in the world, and free itself from accusations of committing war crimes against Yemenis," he said.
Johnson also said he would raise the case of Nazanin Zaghari-Ratcliffe, a British-Iranian mother held in Tehran since 2016, when he meets with Rouhani.
Johnson has been accused of making her plight worse when, in a previous job as foreign minister, he said she had been training journalists in Iran before she was arrested for sedition.
Her family strongly denies this and he swiftly backtracked. Zaghari-Ratcliffe, a project manager with the Thomson Reuters Foundation, the media group's philanthropic arm, denies all charges.