Yemen's Houthi movement said on Tuesday it had carried out four military operations using ballistic missiles and drones against targets in Saudi Arabia and southern Yemen. The Saudi-led coalition, meanwhile, said it had intercepted missiles and a drone fired towards the kingdom.

Houthi military spokesman Yahya Saree said in a statement carried by the group's Al-Masirah channel that the attacks targeted King Khalid International Airport in Riyadh, pumping stations on the East-West oil pipeline, an Aramco facility in Abqaiq, military gatherings in Yemen's Lahj province and the financial centre in Riyadh.

The group denied striking the pipeline in the Medina region, insisting it had hit pumping stations near Riyadh. A source at the Saudi energy ministry had said on Monday that the pipeline was attacked in the Medina area, causing a limited fire that did not affect operations.

The coalition said its air defences destroyed a ballistic missile and a cruise missile aimed at the Saudi capital, intercepted a ballistic missile fired towards the south of the kingdom, and downed a drone over the oil-rich Eastern Province. Saudi civil defence issued alerts for Riyadh, Abha and Khamis Mushait before announcing that the danger had passed.

In Sanaa, the Houthi-run Saba news agency reported Saudi air strikes on the Al-Mafzar gas station in Jadr, north of the capital, and on the state oil company's building in the south of the city. The Houthi health ministry said one person was killed and three wounded in the strikes on the gas facility, according to AFP. There was no Saudi confirmation of the raids.

The escalation follows a Houthi advance in September towards the Bab al-Mandab strait. Schools in Riyadh have switched to remote learning, parents told AFP.