Yemen's Iran-backed Houthis said on Thursday they had hit a pumping station on Saudi Arabia's East-West oil pipeline, an oil site in Yanbu and an Aramco building in Riyadh. They did not say which day the attacks took place.
Later on Thursday, the Saudi-led coalition fighting the Houthis said it had intercepted and destroyed two drones. One was shot down near Riyadh and the other in the oil-rich Eastern Province. Saudi Arabia did not immediately respond to a request for comment.
Riyadh pumps about 4m barrels of crude oil a day through the East-West pipeline to Yanbu on the Red Sea. That is about 4% of world supply.
The pipeline spares Saudi Arabia, the world's biggest oil exporter, from the worst of the blow, while exports from its neighbours have collapsed. The war in the Middle East began in February with a US and Israeli strike on Iran. It has disrupted oil flows through the Strait of Hormuz, which is closed. Saudi Arabia is a US ally and has become a pressure point in the war.
For weeks the Houthis have been firing ballistic missiles and drones at Saudi airports, ports and oil sites. Saudi civil defence said on Wednesday it had intercepted and destroyed two ballistic missiles, and that debris fell in the Mecca area, including in the village of Sabuha.
A Houthi military spokesman on Thursday denied the group had fired the two missiles at Mecca. The Houthis have repeatedly denied targeting Mecca and Medina, the two holiest cities in Islam, and rejected earlier claims by the coalition that they had aimed drones at them.
Fighting flared up again earlier this year, with the Houthis firing missiles and drones at Saudi Arabia and Saudi aircraft hitting targets in Yemen. The escalation also threatens the Bab el-Mandeb, the sea route between the Red Sea and the Gulf of Aden.
The Houthis seized Sanaa in 2014. The next year Saudi Arabia intervened militarily in Yemen to back the internationally recognised government. A UN-brokered truce in 2022 largely froze the conflict.