A test of a liquid propellant for an unidentified missile on 8 August at Russia's test facility near Nenoska and Severodvinsk led to an explosion and fire, the governor of the Arkhangelsk Region, Igor Orlov, said in a VKontakte post on 8 August.
The explosion led to a fire that a video posted on Twitter on 9 August showed burning and producing a large cloud of black smoke.
Estimates of the number of casualties caused by the incident vary, with the TASS news agency reporting on 8 August that 1 person died and at least 10 were injured, while Orlov's VKontakte post said six people were injured.
Want to read more? For analysis on this article and access to all our insight content, please enquire about our subscription options at ihsmarkit.com/janes