Overnight, Ukrainian drones attacked one of the largest arsenals in Russia, causing a powerful detonation in the town of Toropets in Russia's Tver Oblast, a source in the Security Service of Ukraine (SBU) told the Kyiv Independent.

Local authorities have partially evacuated residents of Toropets in Russia’s Tver Oblast after a mass drone attack overnight caused a large fire, Tver Oblast Governor Igor Rudenya claimed on Sept. 18.

The base in Tihoretsk is notable for storing artillery munitions from North Korea, according to Defense Express. Experts report that the Tihoretsk base is relatively small, with a total area of about one square kilometer.

Drones an artillery and missile arsenal in the village of Oktyabrskoye, the Tver oblast north of Moscow, Russian authorities have reported although Ukraine is yet to comment. A missile and artillery arsenal was hit, which was used to store a large range of ammunition, according to Russian information resource ASTRA.

Ukraine's air force said on Thursday it had shot down all 42 drones and one of four missiles used by Russia during overnight attacks. Air defences went into operation in nine Ukrainian regions, the air force said in a statement on the Telegram messaging app nearly 31 months after Russia's full-scale invasion.

A Ukrainian drone attack launched overnight destroyed an ammunition depot in the western Russian region of Tver, a source from Ukraine’s Security Service told CNN.

Ukraine said Thursday its air defenses shot down all 42 drones that Russia used in overnight attacks targeting regions across the country. Ukraine’s air force said it also shot down a Russian guided missile.

Drone attack ‘wipes Russian arms depot off face of the Earth’, says Kyiv - Attack triggered earthquake-sized blast at major Russian ammunition warehouse

Unverified video of the blast, which reportedly forced the evacuation of a nearby town, showed a huge ball of flame blowing up into the night sky.