Around 1,200 square meters of the roof of a Defense Ministry administrative building has caved in hours after it was engulfed by flames earlier on Sunday, RIA Novosti reported citing a source in the city’s emergency services.

Emergency officials fear that more sections of the damaged structure may also collapse.

Overall, about 3,500 meters of floors pace have been gutted by fire.

The blaze broke out on the second floor of the building Sunday morning and quickly spread to 50 square meters.

There are over 260 firefighters now deployed at the site battling the flames, an Emergencies Ministry spokesman said.

(Sputnik)