According to the Pierce County Sheriff’s Office, there were “injuries and casualties” in the incident but it was not clear how many or how severe.
Some 75 people were on board the train, which was headed south, a Washington state Department of Transportation spokesperson said.
The Washington State Department of Transportation said the derailment was blocking all southbound lanes of Interstate 5 near Mounts Road in Pierce County.
This story is developing. Please check back for more updates.