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A fireball goes up at the site of an oil train derailment Monday, Dec 30, 2013, in Casselton, N.D. The train carrying crude oil derailed near Casselton Monday afternoon. Several explosions were reported as some cars on the mile-long train caught fire. (AP Photo/Bruce Crummy)

Fiery derailment in North Dakota

Federal investigators said Wednesday, January 1st that they had recovered a broken axle at the scene of an oil train derailment and fire in southeastern North Dakota on December 30th, but don't know yet whether it caused the wreck.

"We'll want to know if it was the actual cause of the derailment, or was it broken during the derailment?" National Transportation Safety Board member Robert Sumwalt said. (AP)

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