Fire broke out at the Kuibyshev oil refinery in Russia’s Samara region after a Ukrainian drone attacked it on Saturday morning, the Interfax news agency said, citing regional Governor Dmitry Azarov.

The fire engulfed the primary oil refining unit at the facility, owned by Russia’s largest oil producer Rosneft, Azarov said. Ukraine has targeted a number of Russian refineries with drone attacks, often disrupting their work.

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Azarov said a simultaneous drone attack on the Novokuibyshevsky refinery in the region was unsuccessful and its facilities suffered no damage.