It is reported by TASS with reference to local television.
Moreover, according to the deputy head of the city penitentiary service, the condition of the three victims is assessed as critical.
According to preliminary data, a clash between prisoners could have preceded a fire in a correctional facility.
Currently, the fire has been extinguished, the authorities launched an investigation into the incident.
In June, 17 people were evacuated due to a fire in the colony in Tyumen.