Someone should have spotted that burning aircraft on approach and raised some alarms you would have thought.
One of those videos clearly shows it was NOT on fire prior to touchdown. It bounced/skipped, then came down hard the second time (just like the MD11 in Japan), I surmise the main gear collapsed, ruptured a tank and fuel fire ensued, as there is a flash of flame almost immediately after the second touchdown followed by a large puff of smoke/fuel then it ignited.