I am going with a Jihadist pissed that there
was ham at the xmas party.
No jihadist would attend a Christmas Party, other than to blow it up.
Now they are saying one of those shot at the center was a woman with a middle eastern name. Since there is a report that there was some sort of argument in the center, I’m wondering if this was some sort of honor killing, which morphed into also taking out a bunch of infidels. Maybe a dude came to the party to deal with a relative, and it did not go well, and he got offended.