Yemen's Houthi rebels are threatening additional attacks on Saudi oil facilities after claiming responsibility for drone strikes that disrupted Saudi Arabia's crude oil output, the group’s al-Masirah TV reported Monday.

Companies and foreigners should avoid oil facilities because they may be targeted at any moment, Houthi military spokesperson Yahya Saree said via the outlet.

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The Houthi's have claimed responsibility for two drone strikes over the weekend that hit two Saudi refineries, one of which is the largest crude-processing facility in the world.

Oil prices surged worldwide following the attack.

The Houthis have been locked in a long-lasting war with a Saudi-led coalition in Yemen since claiming the country's capital in 2014.

U.S. Secretary of State Mike Pompeo Michael (Mike) Richard PompeoWatchdog confirms State Dept. canceled award for journalist who criticized Trump Trump's push for win with Sudan amps up pressure on Congress Putin nominated for Nobel Peace Prize MORE has accused Iran of being behind the attacks. Tehran has denied the allegations.

Iranian Foreign Minister Javad Zarif tweeted Sunday that Pompeo’s accusation is “turning to ‘max deceit,’” a reference to the Trump administration’s maximum pressure strategy.

"US & its clients are stuck in Yemen because of illusion that weapon superiority will lead to military victory," he wrote. "Blaming Iran won't end disaster."

Pompeo did not provide evidence to back up the accusation that Iran was behind the drone attacks.

President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE on Sunday said the U.S. is prepared to respond to the attacks, but did not assign blame to any party.