When i read about the possibility of fireworks doing this i had my doubts.
For reference, there was a fireworks related explosion in the Netherlands in 2000 (that led to a lot of fireworks regulations being improved afterwards):
https://www.youtube.com/watch?v=aTwW-_OrungWhile sure, there can be a difference and not all of them will look like that one, this surely looked like an explosion way, way stronger then just a bunch of fireworks.
It even had a damn mushroom cloud, that is really scary.
It is somewhat fascinating to see such an explosion filmed though. Hope the death toll is not too high. :(