I'm no expert, but at first glance that looks like a BLEVE to me instead of ordnance detonation. Too much fuel slowly burning off after the fact. Could very well have been a strike that hit a fuel truck or something ofc, but my bet is either neglect or sabotage of some fuel store.
Edit: oh, and the falling large debris in the last clip of the actual explosion is why you do not assume being anywhere near the blast radius is safe. If you ever see a fuel tank of any type burning you turn and run and get to cover strong enough to withstand whatever is burning landing on it from 2km high.