DUBAI/RIYADH, Oct 11 (Reuters) - The Saudi-led coalition in Yemen said an "unidentified projectile" had targeted Riyadh's international airport on Sunday, causing ‌a fire, hours after the Iran-backed Houthis warned airlines and travellers to stay away from Saudi airports.

The coalition also said Saudi air defences had intercepted a cruise missile in the vicinity of King Khalid International Airport. No further details were immediately available.

The airport remains closed after an attack there on Saturday killed 12 people and wounded more than ​300 others, the deadliest such strike on the kingdom in over a decade, amid an escalation of fighting between the Houthis and Yemeni government forces.

Despite ​the airport's temporary closure, the Saudi Energy Ministry said a long-planned international energy conference was still going ahead ⁠in Riyadh on Sunday. The Saudi-led coalition in Yemen said Sunday's projectile had targeted Terminal 4 of the airport, without elaborating.

Earlier, the Houthis had said in ​a statement on X: "We renew our warning to all airlines, experts, employees, workers and travellers against using Saudi airports and airspace, as they are vulnerable ​to attack and have become a theatre of operations for our forces, with the exception of the airports in (the holy cities of) Mecca and Medina."