“Investigators and criminologists of the regional investigative department of the IC of Russia are conducting a detailed examination of the scene of the incident, establishing the causes of what happened,” the agency said.
Earlier it was reported that the cotton gas mixture occurred in a residential building in Yaroslavl. Rescuers evacuated 350 people from the building.
Later, the Ministry of Emergency Situations reported that almost all residents evacuated due to an emergency returned to their apartments.