This article contains some good info:
http://sfgate.com/cgi-bin/article.cgi?f=/c/a/2006/08/29/BAGAEKRCO55.DTL
Per Hugh Hewitt:
UPDATE: A caller to the program who stated he had lived in the neighborhood where the attacks occured asserted that this is a heavily Jewish neighborhood. I have not found that confirmed in the media accounts yet.
UPDATE: Four callers have confirmed that without doubt this is a Jewish neighborhood, and that one of the victimns was run over in front of the Jewish Community Center in the area.
http://hughhewitt.townhall.com/g/fe45debc-c2e0-4e09-a5d4-4cd9de822b80
---"It's a good possibility (the incidents) are all connected,'' Zambonin said.---
Clever that!
Naturally, it being SF, no one had a gun. Carry permits are not issued and most of the gun stores have been run out of town.