Yeah seeing that explosion I can't imagine there were no casualties. Though this was an engine test so I imagine everyone was in some sort of fortified building and as violent as it looks it's mostly just the rocket fuel combusting, not a lot of actual explosive force as you can see the towers still standing. Like the others said it looks like a movie explosion because it is very similar. It's easy to get a massive fireball without a lot of actually destructive force (outside the brief flash of heat).