Hundreds of workers were in "take cover" position after a tunnel in a plutonium finishing plant collapsed in Hanford early Tuesday morning. The tunnel was full of highly contaminated materials such as hot radioactive trains that transport fuel rods.
A train carrying cars full of oil headed for Tacoma derailed Friday in Oregon's scenic Columbia River Gorge, sparking a fire that sent a plume of black smoke high into the sky. One car is still burning. Watch live video here.