A commuter train plowed into the bustling Hoboken rail station during the morning rush hour Thursday, killing at least one person and injuring more than 100 others, some critically, in a tangle of broken concrete, twisted metal and dangling cables, authorities said.

People pulled concrete off bleeding victims and passengers kicked out the windows and crawled out amid crying and screaming after the arriving New Jersey Transit train smashed through a barrier at the end of the track. The train came to a halt in a covered waiting area, collapsing a section of the roof onto the first car.

Ross Bauer, an IT specialist who was heading to his Manhattan job from his home in Hackensack, was sitting in the third or fourth car when the train pulled into the station.

"All of a sudden, there was an abrupt stop and a big jolt that threw people out of their seats. The lights went out, and we heard a loud crashing noise -- like an explosion -- that turned out to be the roof of the terminal," he said. "I heard panicked screams, and everyone was stunned."

The cause of the crash wasn't immediately known. The National Transportation Safety Board said it was sending investigators.

Hoboken, which is NJ Transit's fifth-busiest station with 15,000 boardings per weekday, is situated just across the Hudson River from New York City. It is the final stop for several train lines and a transfer point for many commuters on their way to New York City. Many passengers get off at Hoboken and take ferries or a PATH commuter train to New York.

New Jersey Transit hasn't completed installing positive train control, a safety system designed to prevent accidents by automatically slowing or stopping trains that are going too fast. None of its trains or tracks is fully equipped with the system yet. The industry is under government orders to install PTC, but the work has gone more slowly than expected, and the deadline has been repeatedly extended by regulators at the request of the railroads. The deadline is now the end of 2018.

Assemblyman Raj Mukherji, who represents Hoboken, said transit officials told him one person died and two were critically injured. He didn't know whether those victims had been on the train or on the platform.

Jennifer Nelson, a spokeswoman for NJ Transit, said earlier, "We have multiple injuries, multiple critical injuries right now." Rail service was suspended in and out of Hoboken.

She said she doesn't know yet how fast the train was going when it crashed through the bumper. TV footage and photos from the scene showed the rail car was mangled.

Passenger Bhagyesh Shah said the train was crowded, particularly the first two cars, because they make for an easy exit into the Hoboken station. Passengers in the second car broke the emergency windows to get out.

"I saw a woman pinned under concrete," Shah told WNBC-TV in New York. "A lot of people were bleeding; one guy was crying."

Brian Klein, whose train arrived at the station after the crash, told the Wall Street Journal that transit police ushered everyone aboard his train into a waiting room, "then quickly started yelling, 'Just get out! We don't know if the building is going to hold."'

The train had left Spring Valley, New York, at 7:23 a.m. and crashed at 8:45 a.m., said NJ Transit spokeswoman Nancy Snyder.

"It simply did not stop," WFAN anchor John Minko, who witnessed the crash, told 1010 WINS. "It went right through the barriers and into the reception area."

NJ Transit provides more than 200 million passenger trips annually on bus, rail and light rail lines. More than 100,000 people use NJ Transit trains to commute from New Jersey into New York City daily.

A crash at the same station on a different train line injured more than 30 people in 2011. The PATH commuter train crashed into bumpers at the end of the tracks on a Sunday morning.