US President Donald Trump has instructed to take advantage of oil reserves when needed after the attacks on Saudi Aramco facilities, hinting that he knows who is responsible for them, while oil prices rose by between 15% and 19%.

"Based on the attack on Saudi Arabia, which could have an impact on oil prices, it allowed the withdrawal of strategic oil stocks if needed, and the amount to be determined would be sufficient to maintain market supply," Trump said on Twitter.

In another tweet, Trump said: "Saudi oil supplies have been attacked. We have reason to believe we know the perpetrator.

The US president also played down the chances of meeting with Iranian officials. "The false news is that I am willing to meet with Iran unconditionally. This is not true," he said.

For his part, US Secretary of State Mike Pompeo accused Iran of being behind the attack, calling for a global condemnation of Tehran's multiple attacks on energy sources, and said there was no evidence that the latest attack in Saudi Arabia from Yemen.

Trump's adviser Killian Conway said her country's response to the attack on Saudi oil sites was still under study and open to all possibilities.

A senior US official told Reuters that 19 points were hit in Saudi Arabia, which excludes the attacks by 10 drones, as claimed by the Houthis in Yemen.

The Iranian Foreign Ministry spokesman denied the US accusations, saying they were flimsy.

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Rising prices
Brent crude futures rose more than 19 percent to $ 71.95 a barrel, and US crude futures rose more than 15 percent to $ 63.34 a barrel, Reuters reported.

Reuters quoted a source in Aramco that the return of oil production after the attack may take weeks and not days, as Saudi Energy Minister Abdul Aziz bin Salman said preliminary estimates of the damage to stop production at the rate of five million and 700 thousand barrels per day, which represents half of Saudi production Of oil, as well as gas production stopped by 50% as well.

The Houthi group in Yemen has claimed responsibility for the attacks on the Abqaiq and Khurais plants in eastern Saudi Arabia, the world's first largest oil refinery.