i've had some information from 1 of the 1st people on the scene.
in his opinion the aircraft didnt leave the runway(take off). there was visible skid marks from the aircraft in the ground. also the thrust reversers were seperated from the rest of the aircraft, and stuck in the ground which means they were deployed so the crew were trying to abort the take off.
the aircraft returned to stand because of a false reading on the engine instruments(ram air temperature), which(speculation follws).... could have caused the good engine to not have enough thrust to take off.
the procedure as i am told for this engine is if you have an engine fire you keep thrust applied... take off reach a flight level and then enact the engine fire procedure... fire handle, fire bottles ... etc... then you try to land... in this case it seems not to have happenend