This is reported by the regional branch of the department.

“On this fact ... a criminal case was initiated on the grounds of a crime under Part 3 of Art.

109 of the Criminal Code of Russia (causing death by negligence to two or more persons),” the statement says.

According to preliminary data from the investigation, the victim is the mistress of the house, the mother of five children.

The two older sons, who spent the night with their grandmother, found a 36-year-old woman and her sister and brothers unconscious at about five o'clock in the evening, after which they called an ambulance and law enforcement officers.

As a result of the examination, doctors ascertained the death of a nine-year-old girl of her three-year-old brother.

The mother and four-year-old child were hospitalized and are in critical condition in the hospital.

The cause of death of children could be carbon dioxide due to a malfunction of stove heating.

Earlier it was reported that two children died as a result of carbon monoxide poisoning in the Altai Territory.