All of these images come from the blog of a bloke called Aaron Coghill. Presumably he took these at a major bushfire emergency in 2004 with the majority being Rural Fire Brigades from various places.
Australia is a dry continent and unfortunately we are swinging into a dry period again, where the grass is dying. Very soon without decent rain our fire danger could creep into being catastrophic. All it takes at the moment is a misplaced coke bottle, or a cigarette to ignite the grass, let along arson. There was a big grass fire out at Dundathu in Queensland recently that they had either 22 people or vehicles, not sure which responding to. They reckon it could have been deliberately lit by someone...