Earlier Saturday, two Saudi oil facilities were set on fire by a 10-drone strike claimed by Yemen's Houthi rebel group.
The smoke from the fires could be seen from space.
According to the Wall Street Journal, people familiar with the matter said that Saudi Arabia was forced to shut down around half of its oil output following the attack.
The shutdown amounts to the loss of around 5% of the world's daily production of crude oil.
According to a CNN report, OPEC figures from August put the kingdom's total production at 9.8 million barrels per day which is nearly 10% of the total daily global supply.
There is still no word on the conditions of the oil refineries which are run by the state-owned oil company Saudi Aramco.
While The Wall Street Journal reported that Saudi officials hope to bring the production rate back to normal by Monday, there is no clear timetable.
The destruction of both oil facilities could have a detrimental effect on the world's energy supply. An analysis by the BBC found that the Khurais oilfield produces about 1% of the world's oil while the company's largest facility, Abqaiq, has the capacity to process 7% of the global supply.