Orthodox ping!
Maybe its just because I've been a lawyer too long, but I really think we should try to reserve judgment until the police and/or the FBI do their thing. Sectarian violence is a terrible thing and plagues much of the world, usually involving Mohammedans and I suspect it does here too. But don't jump to conclusions. I've just seen too many cases in the last 28 years when nearly everyone thought a crime had been committed one way by a definite person or persons only to find out in the end it was otherwise.