(click to enlarge)
Here's a stabilized sequence from Jennifer Spell's video, after the "airplane" goes in, and waits, then two totally different types of explosions occur. One is the spectacular orange-black hydrocarbon fireball, meant to represent "jet fuel". But notice the explosion on the lower left. Point sources leave expanding white trails. This looks very much like what happens to the entire building later on, which looks very much like known nuclear reactions.