Boris Johnson has said there is a “very likely” Iran was responsible on the attacks on Saudi oil facilities as he declined to rule out military intervention.

The Prime Minister said his focus is to “de-escalate tensions in the Gulf” but did not rule out resorting to the UK playing a more active role - or imposing tighter sanctions.

He said: “The Americans are proposing to do more to help to defend Saudi Arabia and we will be following that very closely.

“And clearly, if we are asked either by the Saudis or by the Americans to have a role, then we will consider in what way we could be useful.

Asked if he would rule out military action Mr Johnson said: “We will consider in what way we could be useful, if asked. Depending on what the exact plan is.”