A three-story building in New York City has collapsed after what fire officials say was apparently a natural gas explosion.
It is unclear how many people were inside, but at least four people, including one firefighter, are reported injured.
The building housed doctors' offices and the residence of one of the doctors.
A White House spokesman said there is no indication of terrorist involvement.
Witnesses heard a loud explosion before the collapse, which happened before the offices were to open at 9:00 a.m. local time Monday. Gas company officials say people nearby had reported smelling natural gas before the blast.
Fire crews continue to spray water on the smoldering rubble, located just a few blocks from Central Park on Manhattan's East Side.