parabellum
I suspect no fire as the bulk of the spilt fuel fell onto the wet grass and mud and by the time the airframe came to a stop there was no ignition source. Pure conjecture on my part.
That helped no doubt, but additionally jet fuel doesn't ignite very readily unless in an aerosol form.
The lack of a single massive impact (it slowed down gradually) would have made the formation of an aerosol that much less likely.