New York City Buildings Collapsed, 4 Killed

Firefighters respond to a fire on 116th Street in Harlem after a building exploded in huge flames and billowing black smoke, March 12, 2014, in New York. (AP Photo/John Minchillo)

Two New York City apartment buildings on a largely residential Upper Manhattan block at East 116th Street and Park Avenue collapsed in a massive explosion on Wednesday at about 9:30 a.m. (1330 GMT).

Firefighters work the scene of an explosion that leveled two apartment buildings in the East Harlem neighborhood of New York, March 12, 2014. (AP Photo/Jeremy Sailing)

At least four people were killed and at least thirty others were injured, while more than a dozen people are reportedly missing.

Officials feared more victims are trapped in the rubble and they are searching for them.

This undated file photo shows two buildings (center) on 116th St. and Park Ave in East Harlem, that are the subject of building collapse in NYC on March 12, 2014. (Via Google Maps)

Reuters reported that there were a total of 15 apartments in the five-story buildings.

Gas leak is believed to be the caused of explosion.

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Emergency workers respond to the scene of an explosion and building collapse in the East Harlem neighborhood of New York, March 12, 2014. (AP Photo/Jeremy Sailing)

Firefighters respond to a fire on 116th Street in Harlem after a building exploded in huge flames, March 12, 2014, in New York. (AP Photo/John Minchillo)

Firefighters try to extinguish a fire as smoke bellows from the site of a building collapse in Harlem, New York in this picture provided by Adnan Islam March 12, 2014. (REUTERS/Adnan Islam/Handout via Reuters)

Firefighters try to extinguish a fire as smoke bellows from the site of a building collapse in Harlem, New York in this picture provided by Adnan Islam March 12, 2014. (REUTERS/Adnan Islam/Handout via Reuters)

New York City firefighters hose down the rubble from a building that collapsed on Park Ave. and 116th Street in New York, March 12, 2014. (Gordon Donovan/Yahoo News)