On September 14, an explosive drone attack damaged a processing facility and oil field in Abqaiq and Khurais, Saudi Arabia. The Houthi rebel movement in Yemen claimed responsibility for the attack, although U.S. and Saudi officials claimed the attacks originated outside of Yemen. Both countries blamed Iran. Tehran has been widely accused of providing the Houthis with weapons, training and financial support.
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https://iranprimer.usip.org/blog/2019/sep/16/timeline-houthi-attacks-saudi-arabi...