The crew did indicate a problem before landing. If as reported the aircraft 'exploded' in the air, a possibility is a catastrophic engine separation causing explosion.
How likely is an engine to blow during a landing?
How about upon selecting TOGA power for a go around, one engine says 'no' due perhaps to previous damage and goes bang violently, but the other engine says 'yes' and goes to full thrust.
Worst possible scenario at MDA, how often is this practiced, at V1, V2 EFATO yes but on GA ?