NEW YORK (CNN) -- Twenty-four people, including eight children, were injured in an apparent gas explosion at a Harlem apartment building, the New York Fire Department said.



The explosion blew out some of the windows in the five-story building.



John Rodgers, a spokesman for New York-Presbyterian Hospital, said Sunday that four of the eight children were from the same family.



The conditions of all those injured were not immediately known.



One child was in critical condition and the three others were in serious condition, New York Fire Department Commissioner Nicholas Scoppetta said.



All four had burn injuries. One of the injured is an infant.



A firefighter was also injured, but was in stable condition Saturday evening. He apparently was struck by falling debris, Scoppetta said.   About 200 firefighters responded to the scene of the blast on West 119th Street in Harlem.



New York Mayor Michael Bloomberg visited the five-floor building after the explosion.



The 4 p.m. ET blast blew some of the building's windows out, according to firefighters.  Watch rescue workers tend to injured »   Although the blast was still under investigation, Scoppetta said the cause appeared to be a gas leak. New York police said the blast was at the rear of the structure.



Residents who assisted in pulling the injured out of the building said some kind of restaurant was being operated on the bottom floor of the building. Scoppetta refused comment on those reports, citing the ongoing investigation.



An emergency room worker at Harlem Hospital Center said the facility received five to six people from the explosion about 4:30 p.m., but would not provide an update on their conditions.



The building, which has 20 apartments, was evacuated, as were apartment buildings on both sides, Scoppetta said. Building inspectors will examine them to determine their structural integrity.  E-mail to a friend



CNN's Caleb Silver, Jim Acosta and Richard Davis contributed to this report.
what is their condition who was injured About how many firefighters were present? What kind of business was in the basement? What number of children are in serious condition? what was in the building
and the three others were in serious Twenty-four people, 200 restaurant three some kind of restaurant
question: what is their condition, answer: and the three others were in serious | question: who was injured, answer: Twenty-four people, | question: About how many firefighters were present?, answer: 200 | question: What kind of business was in the basement?, answer: restaurant | question: What number of children are in serious condition?, answer: three | question: what was in the building, answer: some kind of restaurant