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‘Worst NYC fire’ in 25 years kills at least 12, injures 4 people

At least 12 people, including at least three children under the age of 10, were killed in a fire Thursday night at a five-story apartment building in the Bronx, one of New York City's boroughs, officials said.

Details about the deadly blaze -- including the cause -- remain unclear. Here's what we know:

  • A 1-year-old, a 2-year-old and a 7-year-old are among those killed, according to the NYPD.
  • Mayor Bill de Blasio called it the "worst fire tragedy in this city in at least a quarter century."
  • Four people were critically injured and others were hurt, the mayor said. He added that it's possible that "we may lose others as well."
  • "This will rank as one of the worst losses of life to a fire in many, many years," de Blasio said in a Thursday press conference.

Blaze spread quickly

The fire started on the first floor and spread quickly, said the city's fire commissioner, Daniel Nigro. The victims, ranging in age from 1 to over 50, died on various floors of the apartment building.

The first call about the fire came at 6:51 p.m. ET and the New York City Fire Department (FDNY) responded within three minutes, Nigro said.

"This tragedy is, without question, historic in its magnitude," he said. "Our hearts go out to every family who lost a loved one here and everyone fighting for their lives."

Shocked residents and family members stood outside the building in frigid temperatures, waiting for news. A local school was opened to shelter those who were displaced by the fire.

A woman, who declined to share her full name with CNN affiliate WPIX, stood anxiously on the street as firefighters wheeled victims out. She said the last text she had gotten from her mother, who lives in the building, was that she was trapped in her third floor apartment.

The walk-up building contained 29 units, according to public property records. CNN attempted to reach the listed property owner several times.

Since 2004, the city received four complaints about the building, which didn't appear to be fire-related. The latest complaint entered Thursday was from the FDNY requesting a structural stability inspection after the deadly, five-alarm fire.

At least 12 people were rescued and are expected to survive, the mayor said. By the time the officials spoke around 10 p.m. ET, the fire had been put out and the building was being searched.

"We are closely monitoring the devastating fire in the Bronx. As always we are thankful for our first responders. Our thoughts are with the victims and their families tonight," New York Governor Andrew Cuomo tweeted.