Yemen's Houthis vowed on Wednesday to press on with attacks on airports and oil facilities in Saudi Arabia, a day after a strike that sources said caused extensive damage to the headquarters of oil giant Saudi Aramco2223.SE.

Yemen's Iran-allied Houthis said Saudi Arabia was attacking the Yemeni capital Sanaa on Tuesday after a Saudi-led coalition warned civilians to stay away from an oil depot on the city's outskirts, part of a rapidly escalating war between the sides.