US officials have pointed fingers at Iran, without explicitly saying the Iranian government itself ordered the assault on the Abqaiq oil facility or that the drones and cruise missiles were launched from Iranian soil.
Saudi officials brought journalists to the kingdom's crucial Abqaiq oil processing facility, described by the state-run oil giant Saudi Aramco as "the largest crude oil stabilization plant in the world".
Amid an unprecedented level of tension in the Persian Gulf, the Pentagon is set to present a wide range of military options to President Donald Trump as the USA leader considers how to respond to an attack on Saudi Arabia's oil industry that many in the administration have blamed on Iran. Pence said Trump will "review the facts, and he'll make a decision about next steps. But the American people can be confident that the United States of America is going to defend our interest in the region, and we're going to stand with our allies".
The recent attacks knocked out more than half of Saudi Arabia's daily crude oil production.
General Joseph Dunford, chairman of the Joint Chiefs of Staff, emphasised on Monday that the question of whether the U.S. responds is a "political judgment" and not for the military.
"It is my job to provide military options to the president should he decide to respond with military force", Dunford said. A return to the company's full 12 million-barrel-a-day capacity is unlikely before the end of November, Prince Abdulaziz bin Salman, the energy minister, said Tuesday. The Treasury statement said the NDF was a major source of foreign currency and funding to Iran's military forces, including the Revolutionary Guard, while Etemad Tejarate Pars concealed financial transfers for military purchases.
President Trump said going into Iran would be a "very easy" decision, but he's showing restraint.
A forensic team from U.S. Central Command is pouring over evidence from cruise missile and drone debris, but the Pentagon said the assessment is not finished.
Officials said 110 contractors evacuated the site after the attack and there were no injuries.
USA officials have been unwilling to predict what kind of response Trump will choose. "It proves to Tehran that there will be no stopping U.S. sanctions unless Iran changes its behavior", he said.