Note: Post edited to update number of protesters, arrests and other details.
As many as 200 protesters blocked entrances to the Oakland Police Department headquarters, nearby intersections and a freeway off-ramp early Monday, leading to 25 arrests.
Singing and chanting slogans like, "Show us what solidarity looks like; this is what solidarity looks like," demonstrators stopped traffic on a two-block stretch of lower Broadway in downtown Oakland most of the morning.
It's the latest in a three-week series of actions focused on police violence against African-Americans -- protests first touched off by a St. Louis County, Missouri, grand jury's decision not to indict an officer who shot and killed Michael Brown, an unarmed black teenager.
One of the organizers, Jova Johnson Vargas, says the protests will continue until police change.