Demonstrators blocked streets and chained four doors of a California police headquarters to protest recent grand jury decisions not to indict white officers who killed unarmed black men in Ferguson, Missouri, and New York.
Police made 25 arrests as the protesters chained themselves to the doors of the Oakland police headquarters during soggy weather and prevented people from getting inside.
Oakland and neighbouring Berkeley have seen numerous protests since grand juries recently declined to indict white officers in the fatal shooting of 18-year-old Michael Brown in Ferguson, Missouri, and the chokehold death of Eric Garner in New York City. Both men were black and unarmed.
Demonstrators in front of one entrance held a sign that read, "End the War on Black People".
"It's not OK, black lives matter," Gopal Dayeneni, one of the protesters, told KTVU-TV.
Television news footage showed about a dozen people blocking two roads off a highway in downtown Oakland near the police building despite steady rain on Monday morning. One protester climbed a flagpole.
Police estimated the number of protesters at between 150 and 200 and said at least some of those blocking roads were also chained to each other.
Later Monday, about 150 high school students in Oakland marched in the East Bay city and a smaller group held a candlelight vigil at Lake Merritt. Both demonstrations were peaceful, Oakland police said.
