Smoke rises from railway cars that were carrying crude oil after derailing in downtown Lac Megantic, Quebec, Canada, Saturday, July 6, 2013. The derailment sparked several explosions and forced the evacuation of up to 1,000 people. (AP Photo/The Canadian Press, Paul Chiasson)

Associated Press
Smoke rises from railway cars that were carrying crude oil after derailing in downtown Lac Megantic, Quebec, Canada, Saturday, July 6, 2013. The derailment sparked several explosions and forced the evacuation of up to 1,000 people. (AP Photo/The Canadian Press, Paul Chiasson)
Smoke rises from railway cars that were carrying crude oil after derailing in downtown Lac Megantic, Quebec, Canada, Saturday, July 6, 2013. The derailment sparked several explosions and forced the evacuation of up to 1,000 people. (AP Photo/The Canadian Press, Paul Chiasson)
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