[Signalman]

Possible that these are 3 home grown terrorists who sympathize with ISIS.

[RoosterRedux]

That's what I have been thinking.

Angry employees don't attack as an organized group. Crazy people don't attack as an organized group.

My guess is that it is either a militia action or terrorism.

But Occam's razor would lean toward terrorism if only because of Paris and the refuge situation in Europe and the U.S.

Conspiracy theorists might add another possibility: Obama sent the CIA or some other operatives in so that he could further his gun control agenda (which he is already trying to insert into this situation).