Gas and oil production accounts for almost half of Saudi Arabia's GDP.
"The Yemeni nation was not the source of the conflict, but it was Saudi Arabia, the UAE, the Americans", he said, according to Iranian media.
A U.S. official, speaking on condition of anonymity, earlier told AFP the USA administration has concluded the attack involved cruise missiles from Iran, and said evidence would be presented at the UN General Assembly next week.
The Saudi Defense Ministry displayed videos and photographs of alleged Iranian weapons it said were used in the attacks during a news conference on Wednesday.
Iranian officials denied the country was responsible for the attacks, and Yemen's Iran-aligned Houthi rebels said they launched the drones that hit the Abqaiq processing plant, which is considered the largest in the world, along with the Khurais oilfield.
Also en route to Saudi Arabia is a team of United Nations experts tasked with investigating the attack, Secretary-General Antonio Guterres said.
At a news conference in Riyadh, Saudi military spokesman Col.
"Despite Iran's efforts to make it appear so" they did not originate from Yemen, Maliki said, adding the strike was beyond the capabilities of the militia - who have however mounted dozens of smaller attacks on Saudi territory. Top military officials reportedly are wary of another war in the Middle East, especially in response to an attack that involved no Americans.
President Donald Trump earlier on Wednesday announced he had instructed the Treasury to "substantially increase USA sanctions" on Iran following the attacks. Saudi Arabia's Energy Minister Prince Abdulaziz bin Salman said the kingdom would aim to ramp up oil and gas production as fast as possible. If the USA were to strike Iran, the Islamic Republic would have little to lose by unleashing an all-out strike on Saudi oil infrastructure.
He said France is talking to "everyone in the region" as it pushes for a diplomatic solution instead of a new military conflict. Australia, Bahrain and the United Kingdom also are taking part.
"If this proof holds water, retaliatory measures by the USA and Saudi Arabia will become more probable", Commerzbank said on Wednesday.
US intelligence agencies were caught flatfooted, never expecting Iran would be so bold as to attack Saudi Arabia directly.
Mr Johnson and Mr Trump discussed the situation this afternoon as they also talked about the Iran nuclear deal and Brexit.
CAVUTO: So Saudi Arabia is more of a problem for us than Iran is?
Hesameddin Ashena, an adviser to Iran's president, tweeted that Saudi Arabia proved that "it knows nothing about where the missiles and drones were made or launched from".
Pompeo will ask the Saudis what they want to do in response to what USA officials have called "a complex and coordinated attack" on their infrastructure.
Saudi Arabia has said oil production would be fully recovered by the end of the month.
Oil prices fell after the Saudi reassurances, having surged more than 20 percent at one point on Monday - the biggest intra-day jump since the 1990-91 Gulf War. The Saudi Air Force, for example, has the ability to retaliate strongly to this attack.
The apparent hardening of the U.S. position came as Iran's supreme leader Ayatollah Ali Khamenei ruled out negotiations with Washington "at any level".
Russian President Vladimir Putin, who has offered to sell defense systems to Riyadh, called for a "thorough and impartial" probe during a phone call with Prince Mohammed. Only a few weeks after the Trump administration ended its sanction waiver on Iranian oil imports on 12 May, four ships were damaged off the coast of Fujairah in the Gulf of Oman. "It's going to take something beyond sanctions to achieve deterrence".
Iran's Supreme Leader Ayatollah Ali Khamenei ruled out talks with the United States unless it returns to the nuclear accord between Iran and the West that Washington quit a year ago.
IRNA separately reported today that Iran's first delegation for the annual U.N. General Assembly meeting had not left Iran because the United States has yet to issue them visas. Both nations are USA allies and have been fighting against the Houthis in Yemen.
At first glance, it might appear that both the United States and Saudi Arabia have no incentive to defuse the situation, as they have much to gain financially.