RIYADH: A drone strike sparked a fire at a Riyadh oil refinery on Friday, in an attack claimed by Yemen’s Houthi rebels as the Iran-backed insurgents made major advances on the embattled Yemeni city of Marib. The attack at dawn on the refinery is the second major assault this month on Saudi energy installations, highlighting a dangerous escalation of Yemen’s six-year conflict …
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March 20, 2021