In general
Fires on the ground threaten the aircraft and its occupants different than fires whilst air borne. Ground fires associated with fuel leaks are aggravated when the aircraft stops and the burning fuel puddles underneath. If the fuel leak can be shut off and the aircraft moved away from the puddle things will get better as long as the cabin is not breeched.
If there is only a fuel leak then the ignition is quite probable when the aircraft stops over the puddle with engines running.
The follow on investigation will likley reveal all the facts in this event so I don't wish to second guess it from just reading the news.