At least three of victims are in serious condition. The firefighters' injuries are minor. Initial searches of the building for other people have been completed, and a second round of searches has begun.
CBS New York says initial reports suggest there may have been a gas explosion on the first floor of the building.
Building resident Tszkan (SEE-kan) Cheung says he heard a "boom, like a bombing, like an earthquake." He saw firefighters carrying out a woman with a severely damaged leg.
The New York Fire Department got the call around 12:45 p.m. Thursday. The fire was under control shortly after 1:30 p.m.