Rescue workers have recovered the bodies of four miners who died during a coal-mine fire in the Siberian region of Kemerovo on January 20.
More than 70 miners were working when a methane-gas fire broke out on January 20.
Sixty-nine were successfully evacuated and a further four miners remain missing.
Search and rescue operations have been hampered by high methane levels in the mine.
Officials in Kemerovo have opened a criminal investigation into charges of safety violations in connection with the incident.
Local authorities have pledged to pay 3 million rubles ($100,000) to the families of the dead miners.
Based on reporting by ITAR-TASS and Interfax