The accident at the Severnaya coalmine in Vorkuta has natural causes, head of the Pechora directorate of Russia's Federal Ecological, Technological and Nuclear Oversight Service (Rostekhnadzor) Alexander Goncharenko said.
"According to the received materials and the preliminary data, the accident has natural causes and is a mining and geological event," he said at an urgent meeting, which Deputy Prime Minister Arkady Dvorkovich held.
Three-day mourning for people who died in the Severnaya mine accident has been declared in the Republic of Komi.
The accident in the Severnaya mine occurred on Feb. 25. A sudden discharge of methane and two explosions happened at the depth of 780 meters and rock collapsed. A fire broke out behind the collapsed rock. According to the latest information, four miners were killed and the fate of 26 remained unknown until Sunday morning.
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