The governor of the Samara region, another Volga riverside province, said that a factory in the city of Chapaevsk had been attacked by Ukrainian drones.
A source in Ukraine’s SBU security service told Reuters that the target was a plant producing industrial explosives and that the strike had caused multiple explosions and fires.
On Friday, a Russian strike on the Ukrainian city of Kryvyi Rih killed at least 19 people, including nine children, local officials said.
Russia’s Defence Ministry said it targeted a military gathering in the city, a statement the Ukrainian military denounced as disinformation.