Story highlights The Amtrak passenger train ran off the tracks and hit vehicles on the road below

Heck tweeted information for people seeking additional details on the situation

Washington (CNN) Washington state's congressional delegation shared their condolences following a train derailment that killed several people on board Monday morning in Pierce County, Washington.

"Heartbroken by the news coming out of WA right now," Washington Democratic Sen. Patty Murray tweeted. "As my staff works to get more info, my thoughts are w/ everyone affected, including the 1st responders doing their best to keep people safe. --PM."

Heartbroken by the news coming out of WA right now. As my staff works to get more info, my thoughts are w/ everyone affected, including the 1st responders doing their best to keep people safe. --PM — Senator Patty Murray (@PattyMurray) December 18, 2017

The Amtrak passenger train ran off the tracks and hit multiple vehicles on the road below, but the fatalities were "all contained to the train," according to Ed Troyer, the Pierce County Sheriff's Office spokesman.

Washington Democratic Rep. Danny Heck tweeted out information for individuals seeking additional details on the situation in a series of tweets, including a map and address for the family reunification center.

"Thoughts & prayers with all involved in @Amtrak 501 train derailment," Heck wrote in another tweet. "Thankful for our first responders doing everything they can to help after this tremendous tragedy. @NTSB will be investigating."

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