The Saudi-led coalition said Sunday that passenger hall 4 at King Khalid International Airport in Riyadh was targeted by an unidentified projectile, according to Roya News. The coalition reported that a fire broke out as a result, and that specialized authorities began handling the incident at the site.

Roya News described the attack as part of a serious security escalation in Saudi Arabia, with repeated strikes on airports and civilian facilities and concern that confrontations could widen, affecting regional security and air traffic.

The same airport was hit on Saturday in an attack that Saudi authorities said left 12 people dead and more than 300 wounded, according to the report. The Saudi-led coalition accused the Houthis of being behind that attack and warned of a firm response, while airport operations were halted to assess damage, Roya News said, citing international media reports.