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Canadian investigators have begun searching the cause of the runaway oil train that derailed in Quebec on Saturday morning.

The carriages of the train exploded in the centre of the small town of Lac-Megantic, destroying at around 30 buildings and killing at least 15 people.

Scattered oil tank wagon wheelsets

Wrecked oil tank wagons

Burnt-out cars

Houses destroyed

Shops burnt to the ground

Satellite images captured by US space agency Nasa two days apart show the scale of the inferno in comparison to major urban centres close to Lac-Megantic.