According to law enforcement agencies, careless handling of fire or short circuit are considered as other versions of the fire.
At the scene of the emergency, an operational investigative group works, which finds out all the circumstances of the incident.
The police also said that the criminal case has not yet been opened.
Earlier it became known that near Kiev, unknown persons burned the house of Gontareva.
The head of the Ministry of Internal Affairs of Ukraine Arsen Avakov on Twitter called this incident "an unacceptable manifestation of criminal pressure."