British Prime Minister Boris Johnson said there is a “very high degree of probability” Iran was behind the drone strikes and missile attacks on Saudi oil facilities, which Tehran denies.
The prime minister declined to rule out military intervention and said sanctions were also a possibility.
On the other hands the US, which also accuses Iran, is sending more troops to Saudi Arabia.
Saudi Arabia has also blamed Iran for carrying out the 14 September attacks, in which 18 drones and seven cruise missiles hit an oil field and processing facility, cutting down 50 percent of Saudi and 5 percent of global oil production.
Speaking onboard an RAF Voyager jet on the way to the United Nations General Assembly in New York, British PM Johnson gave the UK’s first attribution of blame.
He said, “I can tell you that the UK is attributing responsibility with a very high degree of probability to Iran for the Aramco attacks.”
Boris Johnson said he would be working with the US and other European allies “to construct a response that tries to de-escalate tensions in the Gulf region”.
“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,” Johnson said.
Asked if military response was possible, he said, “We will consider in what way we could be useful if asked and depending on what the exact plan is.”
Boris Johnson is also expected to meet US President Donald Trump, and the two have discussed the need for a “united diplomatic response”.
Tehran has warned it would retaliate against any attacks after the US announced it was escalating deployments in Saudi Arabia.