Flames and a large plume of black smoke were seen near Riyadh's main airport on Saturday as Yemen's Houthis said they had attacked sensitive sites in the Saudi capital with missiles and drones.
The group also claimed an attack on an Aramco facility in the Red Sea city of Yanbu, while Saudi authorities had issued overnight warnings of potential aerial attacks before announcing an all-clear.
There was no immediate official Saudi confirmation of the Houthi claims.
Images and video showed smoke rising near King Khalid International Airport, with flames visible near what appeared to be fuel tanks.
Flights at the airport were temporarily disrupted, with delays and cancellations reported, while residents heard apparent explosions across Riyadh.
Saudi Civil Defence sent phone alerts warning of potential danger in Riyadh and Al-Kharj before lifting the warning on Saturday morning.
Houthi military spokesman Yahya al-Sarea said ballistic and cruise missiles and drones had targeted sensitive sites in Riyadh and Aramco facilities in Yanbu.
He said the operation responded to what the group described as Saudi attempts to target Sanaa.
The Houthis have accused Saudi Arabia of carrying out hundreds of strikes across Yemen in recent days.
The attacks marked a further escalation in fighting that has intensified since the Houthis declared a naval blockade against Riyadh in July.
Houthi operations have targeted Saudi cities, energy infrastructure, vessels and shipping in the Red Sea, while the group recently seized Yemen's Red Sea coast, including strategic positions around key shipping routes.
Fighting inside Yemen has also continued, with an unconfirmed AFP report citing military sources saying 48 Houthi and Saudi-backed government fighters were killed on Saturday.
The International Organization for Migration reported Friday that recent fighting had displaced more than 104,796 people.
Iranian official Mohsen Rezaei said Tehran wanted the Saudi-Houthi conflict to end and was continuing consultations with Qatari and Pakistani mediators over broader negotiations.
The UN Security Council on Friday condemned continuing Houthi attacks against Saudi Arabia and the group's 'military escalation' in Yemen.