Renovated in 2018, the facility in Toropets is estimated to have stored tonnes upon tonnes of military goods, including explosives, artillery shells and ballistic missiles.

An unverified viral video and images showed a huge ball of flame blasting high into the night sky. They also showed multiple detonations across a lake in the region.

A large-scale Ukrainian drone attack on Russia triggered an earthquake-sized blast at a major arsenal in the Tver region on Wednesday, forcing the evacuation of a nearby town, war bloggers and some media reported.