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Brent crude futures jumped more than 19% to a session high of $71.95 a barrel at the opening, while U.S. crude futures surged more than 15% to a session high of $63.34 a barrel.

State oil giant Saudi Aramco said the attack cut output by 5.7 million barrels per day, at a time when Aramco is trying to ready itself for what is expected to be the world’s largest share sale.

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.”