The Saudi Arabian government has not assigned any blame and there were no immediate reports of deaths. The attack is estimated to have halted around five percent of world oil production. Yemens Houthi rebels, who took control of Sana in 2014 and have been targeted by Saudi Arabia in a vicious counter-insurgency campaign that has killed thousands of civilians, took credit for the attack. A panel of experts told the U.N. Security Council that the Houthis had acquired drone technology from Iran in January 2018.”]
Source: https://gizmodo.com/drone-attack-on-oil-facilities-shuts-down-half-of-saudi-1838118914