At least four people have been hospitalized in the collapse a building Wednesday from an apparent explosion in the Harlem section of New York City, NBC News reports.

CNN reports as many as 11 people have suffered minor injuries.

One of the buildings housed a piano repair shop with apartments above, and the second housed a church, WCBS reports.

Metro-North service was suspended, officials said, since debris from the building — reportedly five or six stories tall — anded on the elevated train tracks, The New York Times reports.