"...and the fire is inside the engine."
Not necessarily. See
B707 G-ARWE
"The investigation into the accident established that the engine suffered a fatigue failure of its fifth stage Low Pressure Compressor wheel and that parts of the broken wheel had burst through the compressor casing. The engine fuel supply Line was severed and the escaping fuel then ignited. The fire continued to burn because of an omission to close the fuel shut-off valve by pulling the fire shut-off handle when the Engine Fire Drill was carried out."