Somewhere in the region of the shootings, there is going to be a Massive L.A. Bank type gun battle in the next few days.
Multiple perps with semi-auto rifles. Maybe as many as four bad guys.
The best possible scenario for law enforcement, would be for some sort of break though in the case, that would allow them to confront the shooters in a surprise and barricade situation, in which LEOs can surround the building and control the area before the shooting starts.
The worst case scenario, would be a unrelated law enforcement car stop, that turns into a running gun battle on a hwy or civilian area, in which the first LEO units are fed into the battle piece meal as they arrive on scene.
you can bet that if news helicopters get footage of the upcoming shootout, as they did in the L.A. Bank shootout, that those pictures will be splashed all over every electronic and print news outlet from now till the Nov 7 elections.
If it turns out as I believe it will, that the shooters are Middle Eastern Terrorists, then the poll numbers supporting the war on terror, will bound back up into the 80's and the republicans will take back the Senate.
If it turns out to be some sort of home grown right wing nut job conspiracy, then there will be a backlash against American gun owners, the likes of which we have never seen in our life times and the democrats will make gains of it forever.
This may sound cold and political calculating, but these are the unavoidable facts.