Fourteen people were killed, and 17 wounded; some of the wounded are still in critical condition. Apparently the target wasn't the Regional Center or its clients (making the shooters slightly less monstrous than they'd have been if they'd gone there to kill autistic children). It seems that the county health department was using conference space at the Center to have a holiday party, and that's where the attack took place. The story is still fluid, but it's been reported that someone at the party left, and then returned later with an accomplice, both wearing body armor and armed with rifles and handguns and extra ammunition, and simply began shooting. After the attack they fled, but were ultimately tracked down and died in a shootout with police.
It's now been learned that the shooters were a married couple in their late 20s, of Middle Eastern origin, who left behind a six-month-old baby daughter. The husband apparently was a health department employee.
Motive hasn't yet been determined. Speculation has ranged from workplace violence to terrorism, or to some combination of the two. What does seem clear to everyone is that this was not a spur-or-the-moment attack, but something that had been planned, with whatever happened at the party that caused the husband to leave just being the spark that set off the violence.
I'm sure we'll be hearing more. And for the cherry on top of the sundae, neighbors of the couple have told police that they noticed recent odd activity at the couple's home, but didn't want to ask questions or say anything lest they be accused of racial profiling....