jez F. Some guy with a long gun being tracked around, lost him...
The assault seems to have started with a fire alarm being pulled.
The level of planning these three shooters exhibited after that is the scary part.
1. Most government agencies and all hospitals have a fire evacuation plan that places people concentrated out of doors at a rally point so supervisors can count heads. This implies knowledge of local government response plans
2. The shooters had a strict time line they were working too, since 3-to-5 minutes strains any LEO especially responding to a mob scene that a fire alarm plus shooting would cause.
3. The shooters had a good escape plan and switched vehicles immediately after clearing the shooting location. They left in a Black Yukon SUV, which they abandoned shortly afterwards in another parking lot and then got away Scott free. It will take the police time to go through local anti-crime video to ascertain what they left in.
4. The clean escape means wide spread security reactions terrifying the public for days.
NB: Southern California is now a scene for a terrorist war zone, like Boston was after the Marathon bombing,
This spells ISIS, (not ISIL).
I think we are not going to hear these people getting caught for days, unless they strike elsewhere first.