Tensions in the Middle East have escalated following drone attacks on two major oil facilities in Saudi Arabia.

The pre-dawn attacks on Saturday knocked out more than half of crude output from the world's top exporter - five percent of the global oil supply - and cut output by 5.7 million barrels per day.

Yemen's Houthi rebels, who have been locked in a war with a Saudi-UAE-led coalition since 2015, claimed responsibility for the attacks, warning Saudi Arabia their targets "will keep expanding".

But US Secretary of State Mike Pompeo swiftly accused Iran of being behind the assault, without providing any evidence. The claim was rejected by Tehran that said the allegations were meant to justify "actions" against it.

Saudi Arabia, meanwhile, promised to "confront and deal with this terrorist aggression", while US President Donald Trump hinted at possible military action.

Here are the latest updates:

Saudi says will respond if Iran role confirmed

Saudi Arabia's Minister of State for Foreign Affairs Adel al-Jubeir said Riyadh will take the appropriate steps if, as expected, its investigation confirms that Iran is responsible for the attacks. 

"The kingdom will take the appropriate measures based on the results of the investigation, to ensure its security and stability," Jubeir told a news conference, declining to speculate about specific actions.

"We are certain that the launch did not come from Yemen, it came from the north. The investigations will prove that."

Iran threatens to make any aggressor 'main battlefield'

The commander of Iran's Revolutionary Guards warned that any country that attacks the Islamic republic will see its territory turn into the conflict's "main battlefield".

"Whoever wants their land to become the main battlefield, go ahead," Guards commander Hossein Salami told a news conference in Tehran. "We will never allow any war to encroach upon Iran's territory."

"Be careful, limited aggression will not remain limited. We are after punishment and we will continue until the full destruction of any aggressor," he said.

Al Jazeera