Anarchists and other radicals in Oakland, San Francisco, Seattle, and Olympia picked up the banner of anti-police sentiment bravely after the March 29 march in Portland received much corporate coverage as a "riot." Friends of friends of friends exist in every major city. People were talking.
Within a few days, a call-out occurred for West Coast days of solidarity on April 8th and 9th. It is unknown which city first made the call. Pre-existing relationships between anarchists of different cities were used to coordinate action, as well as independent media websites such as Portland Indymedia and Indybay.