Police Lieutenant Michel Brunet would not say how many people might be missing after the 73-car train derailed early Saturday in the town of Lac-Megantic about 155 miles east of Montreal.
Officials say the explosions and fire destroyed a large part of the town's downtown area. Up to 1,000 people were forced from their homes in the town.
Witnesses say the eruptions sent many local residents scrambling through the streets under the intense heat of towering fireballs and a red glow that illuminated the night sky.
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