Investigation underway into cause of deadly wildfire in Lytton, B.C.

Firefighters in British Columbia are making some progress against a catastrophic wildfire that wiped out the village of Lytton, killing two people during a record heat wave. As Paul Haysom explains, as the investigation gets going, there are reports that a CN train may have sparked the flames.

• Lytton wildfire: Witnesses recount train fires in area before village burned