The blaze sent 32 people to hospitals with life-threatening conditions, Daniel Nigro, commissioner of the New York City Fire Department, said earlier Sunday.

The heater was in the bedroom of an apartment, and the fire consumed the room and then the entire apartment, he said.

The apartment door was left open and smoke spread throughout the building when the residents left their unit, Nigro said.

"This is a horrific, horrific, painful moment for the city of New York, and the impact of this fire is going to really bring a level of just pain and despair in our city," Adams said.

About 200 members of the New York City Fire Department responded to the fire at the 19-story building at 333 East 181st Street.

Some of the residents who were trying to leave the building could not "escape because of the volume of smoke."

The FDNY posted several images of the scene showing ladders extending into apartment windows as well as a number of broken windows.

"This is going to be one of the worst fires that we have witnessed during modern times here in the city of New York," Adams said.

"I am horrified by the devastating fire in the Bronx today," New York Gov.

The entire State of New York stands with New York City."

The residential apartment where the fire occurred is 50 years old and has 120 units, according to building records.

There have not been any major building violations or complaints listed against the building, according to city building records.