NEW YORK — A New York City apartment building has exploded in huge flames and billowing black smoke, leading to the collapse of at least one building and 11 injuries.

The New York City fire department says one of the injuries is serious.

According to one report, residents heard a large explosion near Park Avenue and 116th Street in East Harlem around 9 a.m. today. One five-story building appeared to be reduced to rubble, and images from the scene showed a second building also was damaged.

Firefighters battled billowing smoke from ladder trucks. Bricks also cover parked vehicles.

The site is next to Metro-North commuter railroad tracks. Train service was halted to and from Grand Central Terminal.