The US intelligence services have elements that can locate the origin of the shots, said the official speaking on condition of anonymity.

The United States is certain that the weekend attack against Saudi Arabia was conducted from Iranian soil and that cruise missiles were used, said Tuesday to AFP a US official.

Under cover of anonymity

Although the attack was claimed by pro-Iranian Houthi rebels who regularly fire ballistic missiles from targets in southern Yemen from Yemen, the US intelligence services elements that can locate the origin of the shots, said the official speaking under the guise of anonymity. When asked if Washington was certain that the missiles had left Iranian soil, the official answered "yes".

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Likewise, he answered in the affirmative to the question whether cruise missiles had been used. He declined to specify the number of cruise missiles used. "I will not go into that kind of detail," he said.

A halving of oil production

The US administration is preparing a case to prove its case and convince the international community, including Europeans, to the UN General Assembly next week, he added. President Donald Trump said on Monday that Iran appeared to be behind the attack on Saudi Arabia, but added that he still wanted to "avoid" a conflict.

Saturday's shooting resulted in the halving of oil production by the world's largest exporter and thus severely hampering the planet's supply of black gold.