The world’s largest oil processing facility has been hit in a drone attack.
The Abqaiq facility in Saudi Arabia and the Khurais oil field, operated by the state owned Saudi Aramco, were hit early on Saturday, according to the kingdom’s interior ministry.
The strike caused a huge fire at the facility, which is of critical importance to global energy supplies.
It is not known if there are any injuries or fatalities.
Yemen’s Houthi rebels have said on state TV that they were behind the drone attacks. They have previously launched drone attacks on Saudi Arabia.
Military spokesperson Yahia Sarie said the Houthis used 10 drones in the attacks.
He threatened further attacks on the kingdom, unless Saudi Arabia ends the war.
Mr Sarie said: “The only option for the Saudi government is to stop attacking us.”
The Saudi-led coalition have been locked in battle with the Iran-backed Houthi rebels in Yemen since March 2015.
The fires at the facility began after the sites were “targeted by drones,” the interior ministry was quoted as saying by the state-run Saudi Press Agency.
Saudi Aramco, the state-owned oil giant, has not yet commented.
It describes its Abqaiq oil processing facility in Buqyaq as “the largest crude oil stabilisation plant in the world”.
Estimates suggest it can process up to 7 million barrels of crude oil a day, while the Khurais oil field is thought to produce over 1 million barrels of crude oil a day.