Dunn said that the person who died in the crash \"was already passed out when we got to him.\"

Rep. Dan Donovan, R-N.Y., told ABC station WABC that the person who died was inside the truck.

The University of Virginia Health System said Wednesday evening that six patients were transported to UVA Medical Center. One of the patients was listed in critical condition, one was in good condition, one was released, and three were still being evaluated as of 5 p.m.

Rep. Jason Lewis, R-Minn. was transported to a hospital and released after being evaluated for a concussion, according to an aide in his office. An aide tweeted Lewis would take part in the retreat.

\"PHOTO:
AP
PHOTO: Map showing location where an Amtrak train carrying members of Congress collided with a truck, Jan. 31, 2018.
>

Westerman and Rep. Ralph Norman, R-S.C., who was also on the train, said the impact severed the truck in half and sent the front of the train off the tracks. They estimated the train -- which didn't appear to brake upon impact -- to be traveling about 50 miles an hour when it struck the truck.

As ABC News was talking to Westerman, a first responder was walking through the car where he was still sitting, asking: “Is everybody OK?”

“To look out the window and see the debris and the garbage truck, I knew there were probably people injured. My thoughts and prayers are with the ones who are on the truck and our families,” he said.

\"PHOTO:
Rep. Greg Walden/Twitter
PHOTO: This photo posted by Rep. Greg Walden of Oregon shows the scene after a train hit a garbage truck.
>

The NTSB said Wednesday afternoon that it was \"gathering information\" about the cause of the collision, which was not immediately known. The identity of the person who died has not yet been released.

Amtrak added in a statement that two of its crewmembers and three passengers were among those injured.

We're fine, but our train hit a garbage truck. Members with medical training are assisting the drivers of the truck. pic.twitter.com/0I9jOwHTmb

— Rep. Greg Walden (@repgregwalden) January 31, 2018

]/>

The GOP later resumed its schedule. Vice President Mike Pence addressed the gathering at 7 p.m. and said he was in the oval office with the president when they heard the news.

\"We were both deeply troubled at the initial reports but quickly relieved that the scope of the accident was not larger,\" Pence said.

President Donald Trump is scheduled to give remarks to the group on Thursday.

ABC News' Erin Dooley and Stephanie Ebbs contributed to this report.

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