Timelapse footage shows 'fire tornado' form in California wildfire – video

Timelapse video from 25 July captured California's Park fire creating what appears to be a fire tornado'. The fire, burning north-east of the city of Chico, forced thousands of residents in Butte County, about 100 miles north-east of Sacramento, to evacuate their homes. The fire, which stretched over four counties, was believed to be caused by arson, after authorities say a man was seen pushing a burning car into a ravine

• Firefighters battle California's seventh largest wildfire on record as thousands under threat