This is quite similar to other incidents in which people tried to display their craft in public and were shut down because of "terrorism" threats. Take this, for example:
Five teenage girls in Ohio are in big trouble after playing a little Super Mario Bros themed prank. The girls found instructions on the net of how to create real life Mario question blocks and created 17 of them and placed them around their town. Over-excitable members of the community reported the blocks and the Bomb Unit was brought in to deal with the potential threats.
Those are the same blocks shown over at Dinosaur Comics' Ryan North's website.
This is what we've come down to. Anything (or anyone) out of the ordinary slightly jostles our pretty little world, and we have to bring down the hammer on them. If some kid throws his old sneakers over electrical wire, do we need to shut down half the city? Is the guy in the chicken suit outside of Chick Fil-A going to Guantanamo? Does the nerd carrying around a TI-85 need to be detained to determine if he was using a calculator or a detonation device?
Real questions in the United States of Hysteria.