(TIML NEWS) An Amtrak train derailed Monday near Tacoma, Wash., causing injuries and leaving at least one rail car hanging off a bridge over a traffic-clogged interstate, authorities said.

“Derailed Amtrak passenger train was heading south bound,” the Pierce County Sheriff’s Department said in a tweet. “Injuries and casualties reported, numbers to come.”

Interstate 5 southbound near Dupont, about 50 miles south of Tacoma, was closed, the sheriff’s office said.

Gov. Jay Inslee urged commuters to avoid the area during the “ongoing and serious situation.” The National Transportation Safety Board said it was “gathering information” about the accident.

“We are aware of an incident involving Amtrak train 501,” Amtrak said in a statement. “We will update with additional details as they become available.”

Amtrak said service south of Seattle was suspended. Service from Seattle to points north and east continued to operate.

Amtrak Cascades trains connect 18 cities along the I-5 corridor including Seattle, Portland, Vancouver, British Columbia and Eugene, Ore.

“Skip traffic,” Amtrak says on its promotional material for the Cascades trains. “Take the train.”