Updated, it appears that the air outlet in the wheel arch got a new fixture for the breather hose.
It looks like the breather hose is now taking the fumes out of the engine compartment which previously may not have been the case. So the accident cause may be that the hose ended too close to the engine and fuel fumes have ignited in the engine compartment. The fire then went out the vent grill into the wheel arches. Funny thing is the grill in the first picture is metal and the two following pics show a plastic part."