A friend of my son's was there and according to what I've been told, while it was in extremely poor taste, it was evidently not a real attack.
There was a narrator, and the fact that Superman was there to save the day was also a major clue....
(Apologies to those who believed he was real!

)
We like nothing better than to be outraged and to get our 15 minutes of fame, do we....the cynic in me might even think some people have an eye on compensation for the trauma and stress this caused.....