[Sabertooth]

KABC 7... Korean Ariline customer (near El Al) reports 8 to 10 shots, plainclothes officers draw weapons, another volley, then silence...

[Catspaw]

A white guy, overweight, with a ponytail, started yelling, "Artie took my job, Artie took my job" while he was shooting, according to an eyewitness on CNN, and then he started telling jokes.

[Independence]

I think that if it was terrorists they would have wanted to inflict much more damage than they did. To walk up to a specific person and shoot, doesn't sound like their method of operation.
Probably some nut case. We have lots of those here in CA.