Breaking News: Explosion in New York city.

There has been a massive explosion in new york, two buildings are said to have collapsed but we do not know whether it was a bomb or pipeline explosion.
According to (CNN) -- New York police and fire officials were responding to reports of a massive explosion in Manhattan's East Harlem, authorities said Wednesday.

There were at least 11 minor injuries as clouds of dark smoke rose over the residential neighborhood of red-brick tenements, fire officials said.

Metro North commuter rail service, which runs along the site of the blast on Park Avenue, was suspended, officials said.

"Two buildings have collapsed. I hope there is no one in there. It's just rubble," a worker at a nearby flea market said.

Clouds of dark smoke could be seen for a three-block radius as hundreds of rescue officials descended on the scene.

UPDATE: Eye witnesses have confirmed it was a gas explosion.  
A witness told the New York Daily News she had smelled gas "for weeks" before the explosion.
"We saw people flying out of the window... those are my neighbours," Ashley Rivera said.
Another witness told the newspaper he heard two loud explosions that shook the barber shop where he works. More pictures below-

Source: CNN