(UPI) — An Amtrak train derailed on an overpass near Seattle on Monday, with at least one car of the train falling onto Interstate 5, officials said.

“All lanes of southbound I-5 at Mounts Road closed,” the Washington State Department of Transportation said in a tweet.

First responders are treating the derailment of Amtrak 501 as a “mass casualty incident,” KIRO-TV reported.

It is unknown how many people were aboard the train, which left the tracks south of the city of DuPont, in Pierce County, Wash. It was traveling between Seattle and Portland.

“Emergency crews are on the scene and the Amtrak Management is responding,” Amtrak said in a statement. “Some injuries are reported. Service between Seattle and Portland is suspended for the time being.”

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