An investigation has begun into the cause of the New Jersey Transit train crash across the Hudson River in Hoboken that left one person dead and more than 100 others injured. 

The New Jersey Transit train out of Spring Valley, New York was approaching the Hoboken Rail Terminal when it slammed into a platform just before 9 a.m. Thursday. 

Officials from the National Transportation Safety Board arrived at the crash site a short time later. 

Investigators say 34-year-old Fabiola Bittar de Kroon was killed. The Hoboken resident was standing on the platform when she was hit by falling debris. 

Investigators are looking at the engineer's performance, along with the conditions of the train, track and signals. 

They're also working on getting access to the train's data recorders and cameras. 

"We can currently access the locomotive, which is at the end of this train, and we'll be pulling the event recorder this evening. From the event recorder, we hope to get information such as speed and braking," said Bella Dinh-Zarr, vice chairwoman of the NTSB.

Governor Andrew Cuomo and New Jersey Governor Chris Christie toured the site earlier in the day. They said the train was moving at a high speed in a 10 mph zone. The NTSB says they're still investigating that claim. 

Investigators also will examine whether positive train control, a system designed to automatically slow or stop speeding trains, could have helped. The NTSB has been pushing for the technoogy for decades, but Congress has delayed mandating it, and no NJ Transit train has it.

Officials say 108 people were hurt, most of them with minor injuries. 

Sixty-six victims were taken to the Jersey City Medical Center, and most have been treated and released. 

Twenty-three patients were also treated at the Carepoint Health Hoboken University Medical Center, just blocks from the terminal. 

The train's engineer, Thomas Gallagher, was also treated and released. The NTSB says he's a nearly 30-year veteran with New Jersey Transit, and that he's cooperating with their investigation.

The effects of the crash could impact both New York and New Jersey commuters for the morning rush.

There were delays on New Jersey Transit trains for hours after the crash, but service started to get back to normal by the end of Thursday night's evening rush.

Officials expanded bus, rail and light rail service for affected commuters. They also added bus service from the Port Authority to Hoboken.

PATH service to Hoboken was also restored by late Thursday afternoon.

Extra staffers are on hand at both Penn Station and the PATH Station on Sixth Avenue to help direct travelers.

Riders who were expecting a much longer commute were pleasantly surprised.

"I heard about that, that it took about maybe two hours just waiting on a bus. That's crazy," said one commuter.

"I would have thought the bus is going to be overflowed by tomorrow morning and starting to think of alternative ways to get there, the ferry and things like that. But great news that the PATH is up and running again," said another.

Officials say New Jersey Transit rail service remains suspended in Hoboken.

The MTA says it's providing shuttle bus service for affected Metro-North customers during peak hours Friday.

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The presidential candidates offered words of support to the victims of the train crash on Thursday. 

During a campaign rally in Iowa, Hillary Clinton said she was upset to hear about the accident and called it personal to her. 

"I live in New York. People commute into New York from New Jersey. We had about 100 commuters injured and one died," Clinton said. "I just want to send out thoughts and prayers to them. I want to lift up the people of New Jersey and New York."

Donald Trump showed his support on Twitter.