Footage of the attack on a fast-food outlet in the southern city of Melbourne showed two people in dark hoodies and trousers with a container of what police described as “flammable liquid”.
One of them tried to set the fluid alight at the front of the outlet, just out of the view of a camera.
In an instant, the arsonist is seen again engulfed in flames and then hurriedly removing the burning trousers before running off bare-cheeked with an apparently unharmed accomplice.