Attack drones targeted the "Kaluganefteprodukt" oil depot in the city of Kaluga, according to Russian outlet Astra.
Russian officials reported that the city was attacked by three drones, all of which were intercepted and destroyed by air defense systems.
Despite this, debris fell onto the industrial site, specifically the oil depot, igniting a massive fire. Local emergency services and response teams are currently working to contain the blaze.
In addition to reports of the oil depot being hit, there are indications of a possible strike on the Kaluga-based instrument-making enterprise "Typhoon."
The number of damaged and burning tanks is currently unknown. However, given that the fire's focal point is concentrated in a single location, it is likely that one group of tanks was affected.