Smoke seen near Riyadh airport after air raid alerts in Saudi capital

An AFP journalist reported that firefighters could be seen trying to extinguish the flames of a burnt-out fuel tank belonging to state oil and gas company Aramco.

The Saudi Civil Defence had sent out phone alerts overnight warning of potential danger in Riyadh and other regions, before issuing an all-clear on Saturday morning.

Residents told AFP on condition of anonymity that they had heard what sounded like a round of explosions echoing through the city after the alerts.

"In the direction of the airport we saw black smoke and fire," one resident told the agency.

On Friday, the Houthis announced that they had thwarted Saudi attacks on the Yemeni capital Sanaa which they said bore the hallmarks of an Islamic State operation.

Houthi military spokesman Yahya al-Sarea said Saudi Arabia had carried out 300 strikes across Yemen during the past week.

He warned the reported attacks on Sanaa would "not go unanswered".

The Houthis, who are locked in a civil war with Yemen's internationally recognised government, recently seized control of the strategic port city of Mokha and Perim Island, a gateway to a key shipping route used by the Gulf state to export to Asia and Europe.

The group said the naval blockade was in retaliation for a Saudi blockade of ports and airports in Houthi-controlled north-western Yemen.

Saudi vessels have relied on that stretch of the Red Sea for oil exports since the US and Israel's war with Iran effectively closed the Strait of Hormuz.