Some part of the shooting took place at the soldier processing center; and the PX is now surrounded, possibly that last shooter (calling him a sniper) inside. Two of the victims may have been a woman and child. But this is being reported from a local news station, and it may not be accurate of course.
The msm keeps trying to bring up that this could be fratricide, except that it would be highly unusual obviously for two guys with PTSD issues to go ballistic in unison like this.
D - The most likely scenerio is to assume two muslims dressed in uniform, than making the big stretch that a couple of military buddies have gone on a join suicide mission, but it that is still a possibility, just less likely to me than a terrorist plot being carried out. Time will tell.
ETA: Apparently now there is a third shooter who has opened fire, per KCEN.