Very interesting article by Larry Pratt, Gun Owners of America
He talks about evidence gathered by Brian Rohrbough, father of one of the victims. Seems that local law enforcement was well aware of the danger posed by the 2 shooters and since the shooting have tried to cover up much of the evidence. http://www.gunowners.org/op0328.htm
While this in no way absolves either of the murderers for what they did (which I'm sure is what is motivating Mr. Rohrbough), it's still very disheartening.