2-alarm fire damages Fort Collins Comfort Dental dental office building

FORT COLLINS, Colo. - A two-alarm fire burned an office building in Fort Collins Friday morning.

The fire started around 3 a.m. at a Comfort Dental office on South Lemay Avenue near Poudre Valley Hospital. A witness reported hearing an explosion just before the fire broke out, according to the Associated Press.

When firefighters arrived, they found flames coming from two windows, according to Patrick Love, spokesman for the Poudre Fire Authority.

Love said the fire damaged at least two rooms and smoke damaged several other rooms.

There were no injuries.

Investigators are trying to determine what caused the fire.