If memory serves me well, I thought there was a white vehicle described as leaving the scene from the California fires last year as well.
Following is a snip from California's News4 last year:
One man was seen Saturday morning throwing something into roadside brush that caught fire, then he and a companion fled in a white or gray van, officials said. A vehicle similar to the vehicle identified by authorities was found Tuesday. It was parked on a remote road in the high desert.