RIYADH, Saudi Arabia—A drone attack on an oil refinery in Saudi Arabia’s capital, Riyadh, started a small fire that did not cause injuries or affect supplies, the kingdom’s energy ministry said early Friday. The statement did not specify where the drone strike was launched from. Later Friday, Yemen’s rebel Houthis who have been battling a Saudi-led coalition in their country since 2015 claimed responsibility for the drone strike. In a video statement, the rebels’ military spokesman, Brig. Gen. Yehia Sarie, said Houthi forces had targeted an Aramco facility in Riyadh in a multiple drone attack. He also claimed the Houthis had carried out attacks on the Saudi company’s facilities in the areas of Jizan and Abha. The attacks, he said, were a response to the coalition tightening its blockade on the entry of fuel into Houthi-held territory in Yemen. The kingdom’s oil facilities have been targeted by the Houthis in …