The depot appeared to be just kilometers (miles) from another that was struck by Ukrainian drones early Wednesday, injuring 13 people and also causing a huge fire.

Russia said it was working to repel a Ukrainian drone attack on Toropets, where there's a major military depot, as explosions lit up the night.

A partial evacuation has been ordered in Russia's Tver region after a "massive" Ukrainian drone attack sparked a fire there, the local governor has said. Igor Rudenya said emergencies services in the town of Toropets were trying to "localise" the blaze caused by falling drone wreckage.