The Houthi spokesperson Yahya Saree said drone and missile attacks targeted King Khalid International Airport in Riyadh.

The same statement said the Aramco refinery in Rabigh was also hit, along with military installations and smaller airports in the country’s south. According to Middle East Eye, the group targeted King Khalid International Airport for the second time on Monday. The Houthis declared Saudi airspace an open theatre for their operations, except the holy airspaces of Makkah and Madinah. UN Secretary-General António Guterres expressed concern over the “strong escalation” of the fighting in Yemen and condemned the Houthi attacks on Saudi territory, according to AFP.