This is extremely sad. If I am not wrong, this is the 3rd incident of which I know that involved a Chevrolet Vehicle. There was a Captiva which caught fire and then a Cruze. It could be possible that the car might be having some after market installations that would have mal-functioned. Still, the possibility of even manufacturing defect can't be denied either. What ever the probe may result in, a precious life is lost.
Pic Credit: Rushlane