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"Our thoughts and prayers go out to the families and friends of those affected by this morning's tragic train derailment and subsequent fires in Lac-Megantic, Quebec," Harper said.
"We hope evacuees can return to their homes safely and quickly. The people of Lac-Megantic and surrounding areas can rest assured that our government is monitoring the situation and we stand by ready to provide any assistance requested by the province."
The train, reportedly heading toward Maine, belongs to Montreal Maine & Atlantic. According to the railroad's website, the company owns more than 500 miles (800 kilometers) of track serving Maine, Vermont, Quebec and New Brunswick.
Last week a train carrying petroleum products derailed in Calgary, Alberta, when a flood-damaged bridge sagged toward the still-swollen Bow River. The derailed rail cars were removed without spilling their cargo.
The Quebec accident was likely to have an impact across the border. In Maine, environmentalists and state officials had previously raised concerns about the threat of an accident and a spill from railroad tank cars carrying crude oil across the state.
The Montreal, Maine and Atlantic Railway carried nearly 3 million barrels of oil across Maine last year. Each tank car holds some 30,000 gallons (113,600 liters) of oil.
The Maine Department of Environmental Protection has begun developing protection plans for the areas where the trains travel, spokeswoman Samantha Warren said recently.