CBS reports that high-speed, southbound Amtrak Cascades train 501 derailed on an overpass this morning near DuPont in Washington state. At least one train car crashed down onto Interstate 5 and blocked all lanes of traffic.
Authorities say that injuries and casualties have been reported but no details as to how many have been given. First responders are treating the accident as a mass casualty event.
The cause of the accident is still under investigation by the National Transportation Safety Board (NTSB).