Five people are injured Friday night as city firefighters battle a five-alarm blaze in a Bronx apartment building, officials said.

"We couldn't even breathe, we couldn't see anything, it was straight pitch-black," said one woman who lives on the sixth floor.

The city fire department responded to the blaze at the building on Grand Concourse near Rockwood Street in the Mt. Eden section of the Bronx around 8:15 p.m.

Three firefighters suffered minor injuries. According to the FDNY, a civilian and a firefighter suffered serious injuries, but they were expected to survive.

The fire started on the sixth floor of the six-story building and spread to the cockloft, the FDNY said. It escalated to five alarms in less than 90 minutes.

Around 200 firefighters were at the scene around 10:45 p.m.

(Firefighters work to knock down the fire on Grand Concourse near Rockwood Street. Ruschell Boone and Edric Robinson/NY1.)

Several blocks of Grand Concourse were closed off around 10:30 p.m.