(Lac Megantic)  --  Canadian officials have launched a criminal probe into the runaway oil train that leveled a town center not far from the Maine border.  Dozens of oil tankers exploded in the village of Lac Megantic early Saturday after the driverless train derailed at high speed.  At least 15 are dead and three dozen remain missing.  Investigators are looking at what happened after firefighters extinguished a blaze on one of the locomotives hours before the disaster.