A train has crashed through a station during rush hour in New Jersey and many passengers are feared injured.
Pictures show huge damage to the Hoboken station, with metal falling from the roof.
A police officer told NBC New York that there were "mass casualties".
There are no initial signs Hoboken train crash was terror related or deliberate act, local officials told NBC.
Fire officials said they were investigating the crash as a possible derailment.
Passenger Bhagyesh Shah told NBC New York: "I saw a woman pinned under concrete.
"A lot of people were bleeding; one guy was crying."
He said the train was crowded, particularly the first two cars, because they make for an easy exit into the Hoboken station and onto the PATH train. Passengers in the second car broke the emergency windows to get out.
Several people who were on the train tweeted they felt "lucky to be alive."
A passenger called Laura tweeted: "My train just derailed and crashed into the Hoboken train station. Thankfully all I got was a crack to my head, please pray for the rest."
All services at the station are suspended.