DUBAI, United Arab Emirates (AP) Drones claimed by Yemens Houthi rebels attacked the worlds largest oil processing facility in Saudi Arabia and a major oilfield operated by Saudi Aramco early Saturday, sparking a huge fire at a processor crucial to global energy supplies.

It wasnt clear if there were any injuries in the attacks in Buqyaq and the Khurais oil field, nor what effect it would have on oil production in the kingdom. The attack also likely will heighten tensions further across the wider Persian Gulf amid a confrontation between the U.S. and Iran over its unraveling nuclear deal with world powers. The Houthis are backed by Tehran amid a yearslong Saudi-led war against them in Yemen.