The roof collapsed in the burning building of the Ministry of Defense of the Russian Federation on Znamenka Street in Moscow. This was reported by Interfax, citing a source in emergency services.
The collapse occurred on an area of about 1200 square meters.
According to a representative of the ministry, the roof was collapsed on purpose "to facilitate spilling water, eliminate fires and smoldering, and conduct additional reconnaissance in the building," Interfax reports.
Earlier, Defense Ministry spokesman Igor Konashenkov said firefighters had put out the open fire.
More than 250 people and 72 pieces of equipment are involved in extinguishing the fire. According to unconfirmed reports, one firefighter received heat stroke, TASS reports .