U.S. President Donald Trump said on Sunday the United States was "locked and loaded" for a potential response to the attack on Saudi Arabia's oil facilities, after a senior U.S. administration official said Iran was to blame. Trump also authorized the use of the U.S. emergency oil stockpile to ensure stable supplies after the attack, which shut 5% of world production and sent crude prices soaring more than 19% in early trade on Monday, before moderating to show a 10% gain. There is reason to believe that we know the culprit, are locked and loaded depending on verification, but are waiting to hear from the Kingdom as to who they believe was the cause of this attack, and under what terms we would proceed!" Trump said on Twitter. Earlier in the day, a senior U.S. official told reporters that evidence from the attack, which hit the world's biggest oil-processing facility, indicated Iran was behind it, instead of the Yemeni Houthi group that had claimed responsibility. U.S. Secretary of State Mike Pompeo also said there was no evidence the attack came from Yemen, where a Saudi-led coalition has been battling the Houthis for over four years in a conflict widely seen as a proxy war between Saudi Arabia and Shi'ite Muslim rival Iran. "Amid all the calls for de-escalation, Iran has now launched an unprecedented attack on the world's energy supply," Pompeo said. Iranian Foreign Ministry spokesman Abbas Mousavi dismissed the U.S. allegations that it was responsible was "pointless". A senior Revolutionary Guards commander warned the Islamic Republic was ready for "full-fledged" war. "All American bases and their aircraft carriers in a distance of up to 2,000 kilometers around Iran are within the range of our missiles," the semi-official Tasnim news agency quoted Commander Amirali Hajizadeh as saying. Tensions between Washington and Tehran were already running high because of a long-running dispute between the two nations over Iran's nuclear program that led the United States to impose sweeping sanctions. Oil prices surged as much as 19% in early Asian trade on Monday on worries over global supply and soaring tensions in the Middle East. Brent crude LCOc1 posted its biggest intra-day percentage gain since the start of the Gulf War in 1991. State oil giant Saudi Aramco said the attack on Saturday had cut output by 5.7 million barrels per day. The U.S. official, who asked not to be named, said on Sunday there were 19 points of impact in the attack on Saudi facilities and evidence showed the launch area was west-northwest of the targets – not south from Yemen. The official added that Saudi officials indicated they had seen signs that cruise missiles were used in the attack, which is inconsistent with the Iran-aligned Houthi group's claim that it conducted the attack with 10 drones. "There's no doubt that Iran is responsible for this. No matter how you slice it, there's no escaping it. There's no other candidate," the official told reporters. Riyadh has accused Iran of being behind previous attacks on oil-pumping stations and the Shaybah oil field, charges that Tehran denies, but has not blamed anyone for Saturday's strike. Riyadh also says Tehran arms the Houthis, a charge both deny. Richard Nephew, a program director at Columbia University's Center on Global Energy Policy, said if Iran was responsible for the attack, it may be as retribution for U.S. sanctions. "They are making decisions about whether and how to respond to what they see as a massive attack on their interests from the U.S. via sanctions by attacking U.S. interests in turn, and those of U.S. partners they believe are responsible for U.S. policy," he said. Aramco gave no timeline for output resumption. A source close to the matter told Reuters the return to full oil capacity could take "weeks, not days". Riyadh said it would compensate for the damage at its facilities by drawing on its stocks, which stood at 188 million barrels in June, according to official data. Trump said he had "authorized the release of oil from the Strategic Petroleum Reserve, if needed, in a to-be-determined amount sufficient to keep the markets well-supplied."
