Later in the day, the Saudi Foreign Ministry said the attacks, which halted 50 percent of the kingdom's oil output, employed Iranian weapons, but an investigation to determine the source of the bombing is still underway.
"The terrorist attack did not originate from Yemen as the Houthi militia claimed", he said, adding that authorities would reveal the location from where drones were launched at a future news conference.
"The president didn't name Iran earlier in tweets he submitted Sunday stating the U.S. understood the" offender", but hadn't identified Iran, that was termed but by Secretary of State Mike Pompeo along with other officials, who've also released satellite pictures to back their claims. According to reports, oil prices witnessed their biggest daily gain since the Gulf war in 1991.
Saudi Arabia, which has supported tougher USA sanctions on Iran, said on Monday an initial investigation showed the strikes were carried out with Iranian weapons, but provided no evidence.
"It's certainly looking that way, at this moment", Mr. Trump said. "There is no evidence the attacks came from Yemen". Iran denied it was to blame.
But AAA says this shutdown of the oil facilities in Saudi Arabia will affect the worldwide price of crude oil.
The attacks on Saudi Aramco's crude-processing facilities at Abqaiq and Khurais cut its output by 5.7 million barrels a day and threw into question its ability to maintain oil exports.
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USA president Donald Trump said he would release United States reserves, easing concerns.
While speaking to reporters on Monday, Trump also noted that diplomacy has not been exhausted when dealing with Iran.
"Do I want war?"
Following the attack, US Senator Lindsey Graham blamed Iran with baseless accusations, recommending that the US "put on the table an attack on Iranian oil refineries if they continue their provocations".
The prospect of releases from strategic oil reserves in the United States, and other industrialized countries that the International Energy Agency advises, such as Japan, have weighed on prices, but the geopolitical threat of retaliation is causing concerns. "In return, we have to prove that the policy is not worth a penny for the Iranian nation", Khamenei said.
The attacks on September 14 was carried out by 10 unmanned aircraft. Oil giant Saudi Aramco expects that it will take weeks to months before most of the production problems are solved.
"Otherwise, no talks will happen ... with the Americans", he said.