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Canada's Prime Minister Stephen Harper speaks with firefighters while he tours the wreckage of the train explosion in Lac Megantic, Quebec, Canada, July 7, 2013.

A volunteer gives clothes to a woman who was evacuated from her home after the train explosion in Lac Megantic, Quebec, July 7, 2013.

A view Lac Megantic, Quebec, after a driverless freight train derailed and exploded, July 7, 2013.

A burnt out vehicle sits near the wreckage of a train car after a train derailment in Lac-Megantic, Quebec, July 7, 2013.

Smoke billows from fire at the site of a train derailment in Lac Megantic, Quebec, July 6, 2013.

Melted siding on a home is seen near the scene of a train derailment in Lac Megantic, Quebec, July 7, 2013.