Explosion at plant in Russian Urals city kills four

Teksler, who did not identify the plant, said in a later post that a second explosion had occurred and emergency crews were at the site to bring a fire under control.

Five people had been seriously hurt.

He said there was no indication the incident was linked in any way to drone activity.

Russia's Emergencies Ministry, quoted by news agencies, said emergency crews were bringing under control a fire which had broken out at the plant.