Amtrak train falls onto highway in Washington

PIERCE COUNTY, Washington - Emergency responders are on the scene of a train derailment in the state of Washington.CBS News Special Report: A high-speed Amtrak train has derailed in Washington State with reported casualties.CBS News confirms an Amtrak train derailed onto Interstate 5 in Pierce County.CBS News affiliate KIRO-TV reports first responders are treating the derailment as a mass casualty incident. Authorities have not yet provided details on injuries.Photos of the crash show the train