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N.D. train crash still burning, fire hampering investigation

The evacuation order has been lifted for Castelton, N.D., as investigators begin to try to figure out what caused the train derailment. While no one was injured, the intense flames -- fueled by crude oil – are hampering investigators. Jeff Pegues reports on the crash, as well as increasing concerns about safety as America’s oil boom has increased traffic for the nation’s railroads.