If I recall correctly, the ac hit the undershoot of the 'old' runway causing substantial damage to the undercarriage in the process. They rolled (sort of) in order to try a belly landing, with bits falling off the ac, then the ac exploded in mid-air, killing the rear crew before they could bail out. Only the 2 pilots survived.
I seem to recall being told that the rules were changed shortly afterwards to ensure that the crew entrance ladder was always lashed down as the ladder in the Malta accident had obstructed the crew entrance door?
Edited to add: Seems my memory was correct, I've just found this very full account:
http://www.flightlinemalta.com/airaccidents/XM645/ . Note that the co-pilot is at one point incorrectly described as the 'navigator'.