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Boris Johnson and Donald Trump have discussed the need for a "united diplomatic response" to the attacks on Saudi oil facilities.

Downing Street said the PM and President had spoken on the phone to discuss the crisis.

A No10 spokesman said: “They condemned the attacks and discussed the need for a united diplomatic response from international partners.

“They also spoke about Iran and agreed that they must not be allowed to obtain a nuclear weapon.

“The Prime Minister and the President briefly discussed Brexit and looked forward to UNGA (United Nations General Assembly) next week.”

The two leaders will meet in person at next week's meeting of the Assembly in New York, which is expected to be dominated by talks surrounding Iran.

(Image: AFP/Getty Images)

The call took place as Saudi Arabia said attacks on oil sites were 'unquestionably sponsored by Iran'.

Remnants of drones and missiles it says were used in attacks on its oil facilities were displayed at a press conference today.

The country said the drone and missile debris was "undeniable" evidence of Iranian aggression.

The bombing of the Abqaiq oil processing plant, the world’s largest, and the Khurais oil field, knocked out 5% of the world’s oil supply, with oil prices rising 20%.

(Image: REUTERS)

Defence Ministry spokesman Col. Turki al-Malki said Iranian Delta Wing unmanned aerial vehicles (UAV) were used in addition to cruise missiles.

"The attack was launched from the north and unquestionably sponsored by Iran," he told a news conference.

The bombings halved the kingdom’s crude oil production and could see petrol at UK pumps leap 5p a litre.