Saudi Arabia's state oil giant Aramco halted operations at its massive Ras Tanura refinery on Monday after a drone strike targeted the facility, an industry source told Reuters, marking a dramatic escalation in the regional conflict as Iran retaliated against U.S. and Israeli strikes that killed Supreme Leader Ayatollah Ali Khamenei.

The attack on Ras Tanura—one of the world's largest refineries with a capacity of over 550,000 barrels per day—occurred early Monday local time amid a barrage of Iranian drones and missiles across the Gulf. Saudi Arabia's defense ministry confirmed that two drones targeting the site were intercepted by air defenses, with debris causing a limited, isolated fire that was quickly brought under control. No injuries were reported at the facility, and officials described the situation as stable.