@izzythepush,
a) I'm not a gun nut. I agree that this tragedy is in large part due to the unique availability of firearms in the US, which I also agree is a big problem.
b) How it gets dealt with by the government depends a great deal on how it's classified legally. For example, who has jurisdiction over the investigation, local or state police, FBI, CIA, Dept. of Homeland Security, etc, depends on that classification.