It appears to be related to the war:

At least five people were shot – one fatally – this afternoon at the Jewish Federation of Greater Seattle by a man a witness said was upset about “what was going on in Israel.”
Police spokesman Rich Pruitt said there was one shooter, who was apprehended without incident outside the Jewish Federation Building located on the corner of Third Avenue and Virginia Street. Pruitt said there were at least two victims on the third floor of the building.
[…]
The Jewish Federation of Greater Seattle was established 1926. According to its Web site, its mission is to “ensure Jewish survival and to enhance the quality of Jewish life locally, in Israel and worldwide.”

Read the rest here.
(Link via Little Green Footballs)