Update, 1:25 p.m.: A morning-long protest that shut down access to the San Francisco Police Department's Mission Station has concluded -- with plenty of pointed commentary about the department's past officer-involved shootings, but with no arrests.
Scores of protesters were gathered around the station at 17th and Valencia streets from just before 8 a.m. to just after noon Monday.
Original post: Dozens of demonstrators, including more than a dozen who are chained together, are staging a protest at the San Francisco Police Department's Mission Station.
The protesters are targeting both police violence -- some carried banners referring to the officer-involved shooting a year ago of Alejandro Nieto -- and gentrification in the Mission.
The action at 17th and Valencia streets began about 7:45 a.m. and halted some early rush-hour traffic, including an eBay shuttle. Some protesters chained themselves together across the entrance to the police station's parking lot. Others were chained together in two different spots on Valencia Street.
As of 9 a.m., the protests continue (see livestreaming video above). Police officers were keeping a low profile outside the station, observing the demonstration but taking no action so far to clear the street.