A Ukrainian attack on the major petroleum hub of Nizhnekamsk in Russia’s Tatarstan region killed at least 13 people and wounded 78 others Monday, local authorities said, marking one of the deadliest strikes inside Russia since the war began.

The Ukrainian military said it hit an oil refinery in Nizhnekamsk, which is about 1,200 kilometers (750 miles) east of the Ukrainian border and has a population of about 240,000.

Russian officials didn't say what the drones targeted, but the city is home to two refineries and a petrochemical plant. Ukraine has targeted Russian oil facilities with long-range drones almost daily in recent months. The campaign has caused fuel shortages in Russia, eaten into its refining capacity and unsettled the population.

Previous Ukrainian attacks on Russian soil with high death tolls have come in the border region of Belgorod. In December 2023, Ukrainian shelling of the region’s capital, also called Belgorod, killed 25 people and wounded over 100, local officials said. Five months later, a Belgorod apartment building partially collapsed after shelling, killing at least 13, according to Russian authorities.

Also on Monday, several Ukrainian drones sparked a fire at an industrial facility in the Tyumen region of western Siberia, said Gov. Alexander Moor, without offering any details.