MOSCOW, June 5 (RAPSI) – A preliminary reason of the petroleum reservoir unsealing at a heat and power plant in Russia’s northern town Norilsk is subsidence of ground and concrete under it, the press service of the Prosecutor General’s Office reports.

Prosecutors continue checks over the industrial disaster in Norilsk, the statement reads.

According to case papers, on May 29, over 20 tons of petrochemicals spreaded over the thermal power station and flew into the subsoil and waters near the Nadezhinsky iron and steel plant that resulted in the environment pollution and harm.

Three cases opened after the thermal power plant disaster were consolidated into a single case and forwarded to the Investigative Committee’s Main Investigations Directorate for the investigation. Investigators are checking the incident for the ground spoiling, environmental offence and water pollution.

On June 4, the Krasnoyarsk Krai Court placed a chief of the boiler-and-turbine floor of the heat and power plant in detention until July 31. Vyacheslav Starostin refused to give testimony.