On Thursday, smoke caused the deaths of 52 workers, including six rescuers, at a coal mine in Russia's Kemerovo Region.

It was the country's worst mine catastrophe in five years.

According to early data, there were no survivors in the Listvyazhnaya mine, according to TASS, adding that the majority of the remains are still below and will be brought to the surface when temperature and methane concentration allows.

It was previously stated that 11 miners were killed at a depth of 250 meters owing to the igniting of coal dust in the ventilation and the resulting smoke.

According to regional officials, 38 individuals were hospitalized, four of them were in critical condition, and 13 others needed outpatient care.

When the catastrophe occurred, there were 285 individuals underground, and the majority of them were hauled out.

Russian President Vladimir Putin sent his "deepest sympathies" to the victims' families. From Friday through Sunday, the Kemerovo Region will observe three days of sorrow.