An explosion rang out in the area of a defence facility in the city of Biysk, Altai Krai, Russia, on the morning of 15 February. Authorities claim that "technological processes" took place there. Source: Mayor of Biysk Viktor Shchigrev on Telegram; Meduza, Latvia-based Russian outlet Details: Residents of Biysk reportedly heard an explosion and observed a plume of smoke over the city.