What to know

• A fire broke out at an oil facility in the Saudi capital, Riyadh, sending dense black smoke into the air, an eyewitness said, speaking on condition of anonymity for his safety.It wasn't clear what caused the fire at an Aramco oil refinery. Authorities tightene...S1
• The fire comes amid escalating hostilities between Saudi Arabia and Yemen's Iran-aligned Houthis, who have stepped up attacks on Saudi cities and energy infrastructure.S2