It was a large-scale drone attack, Radmir Belyaev, the mayor of Nizhnekamsk, wrote on social media. He said an industrial plant and a residential building were damaged.
According to Ukrainian and Russian media reports, the facility damaged was a petrochemical plant. Nizhnekamsk is a hub in Russia's oil industry, with several oil refineries and a large petrochemical plant where oil is processed.
The city is almost 900 kilometers east of Moscow. Ukraine has targeted the city's industry several times before, causing major fires.
The Russian military said more than 500 Ukrainian drones were shot down over Russian and Russian-occupied territory overnight.
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