Ukrainian drones attacked industrial facilities in the province of Tatarstan, Russian authorities said Tuesday, in what would be Kyiv’s deepest strike inside Russian territory since the war began more than two years ago. The attack on facilities near the cities of Yelabuga and Nizhnekamsk, located some 1,200 km east of Ukraine, injured 12 people, Russian regional authorities said.

The strike damaged a hostel for students and workers in a free economic zone where a factory manufacturing Iranian-designed drones is reportedly located, other media reports said. Tatarstan is known for its high level of industrialization. Tatarstan officials said the attack didn’t disrupt industrial production, while Nizhnekamsk’s mayor said the attempt to strike a refinery was thwarted by air defenses.