“The balloon, and it turned out to be more than one, was depressurized, and an explosion occurred,” RIA Novosti quotes him.
Kurenkov said that one of the residents of the house had smelled gas the day before, and specified that the house had not been gasified.
Earlier, investigators opened a criminal case on the fact of a partial collapse of a residential building in Nizhnevartovsk.
According to the latest information, six people died as a result of the incident.