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.

In Toropets, Tver region, Russia, a fire broke out during the night of September 18. The fire occurred against the backdrop of a drone attack and ongoing air defense operations in the region, according to the governor of the Tver region Igor Rudenya.

Ukraine has repeatedly targeted border regions such as Bryansk, Kursk and Belgorod. The attack on Tver, about 500 kilometers from the border, is not as common, but is an example of what Ukrainian officials have repeatedly said they want to do in order to hit Russian military infrastructure that could be used to attack Ukraine.

Massive explosions and a huge fire tore through Russia's Tver region early on September 18. The region's governor said debris from a downed drone struck an arms depot, but a Ukrainian military expert said the site had been targeted.

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.

Ukrainian drone attack on Russian arsenal triggers explosions, fire, and evacuation. US defense stocks react to reports.

A substantial Ukrainian drone attack in Russia's Tver region ignited a massive explosion and led to partial evacuations. Unverified reports and media reveal a huge fireball in the night sky and minor earthquake detections.

NASA satellites picked up intense heat sources emanating from an area of about 14 square kilometres (5 square miles) at the site in the early hours and earthquake monitoring stations picked up what sensors thought was a small earthquake,

Unverified footage shared on social media depicted a massive fireball shooting into the night sky, accompanied by multiple explosions resonating across a lake approximately 380 kilometers (240 miles) west of Moscow.