Two people have died and two others have been treated for smoke inhalation following a blaze in New York City.

The blaze broke out in the area of West 44th Street and Broadway around 7 p.m.

ET, New York Fire Department officials said.

They described the explosion as a “combustion explosion.”

The cause of the explosion has not yet been determined, the FDNY said.

The three fatalities were a six-year age boy and a six-, seven- and eight-year olds son, police said.

No one else was injured.

The FDNY is investigating.

It was not immediately clear what caused the fire.

It’s unclear how many people were inside the building at the time of the blaze.

Authorities did not immediately provide any details on how many devices were in the building.