Except for the fact that the Boston Marathon bombings happened, and young Muslims, even those born in America, are being radicalized by ISIS every day. I think they just didn’t know what to make of the whole thing and didn’t want to take any chances.
Well, yes it should have got their attention. But at no point did anyone at the school think it was a bomb. If they had, the school would have been evacuated.
By calling the police, all they managed to do was make the kid famous, rich and cultivate sympathethy for Muslims.