At least 19 killed and dozens injured in an 'unprecedented' fire at an apartment building in the Bronx

• At least 19 people have died, including 9 children, in a fire that broke out at a 19-story apartment building in the Bronx, according to ABC News.
• At least 31 people were seriously injured in the blaze, and all injuries were due to smoke, the FDNY said.

At least 19 people were killed and dozens were injured when a fire broke out Sunday in an apartment building in the Bronx borough of New York City, according to media reports and fire department officials.

Among the 19 dead were 9 children, FDNY sources told ABC News. At least 13 other people have life-threatening injuries, according to the report.

"This is going to be one of the worst fires we have witnessed here in modern times in the city of New York," New York City Mayor Eric Adams said on Sunday.

More than 200 firefighters responded to the 5-alarm blaze at a 19-story apartment building at 333 East 181 Street, the New York City Fire Department said in a tweet. More than 60 people sustained injuries, agency officials said, according to ABC 7 New York. The agency said on Twitter at least 31 people were seriously injured.

According to CNN, the agency said it began receiving calls about the fire at around 11 a.m. Sunday, with calls coming from residents on the upper levels of the building.

"The smoke conditions in this building are unprecedented," said FDNY Commissioner Daniel Nigro at a press conference, according to ABC 7 New York. Nigro said he expected "numerous fatalities."

A door left open in the building allowed the fire and smoke to spread throughout the structure, Nigro said, according to ABC News.

All of the injuries were due to smoke inhalation. No one was burned in the fire, Nigro said at the press conference.

The cause of the blaze is not yet known.