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Protesters block roads after chaining themselves to front doors of Oakland police headquarters

  • An Oakland police officer stands guard at the front door of police headquarters as another uses bolt cutters to free protestors who chained themselves to it Monday, Dec. 15, 2014, in Oakland, Calif. Demonstrators blocked streets around Oakland police headquarters and chained themselves to the front of the building Monday to protest recent grand jury decisions not to indict white officers who killed unarmed black men in Ferguson, Missouri, and New York. (AP Photo/Ben Margot)

    An Oakland police officer stands guard at the front door of police headquarters as another uses bolt cutters to free protestors who chained themselves to it Monday, Dec. 15, 2014, in Oakland, Calif. Demonstrators blocked streets around Oakland police headquarters and chained themselves to the front of the building Monday to protest recent grand jury decisions not to indict white officers who killed unarmed black men in Ferguson, Missouri, and New York. (AP Photo/Ben Margot)  (The Associated Press)

  • A protestor hangs a banner which reads "Black Lives Matter," atop the flagpole of the Oakland Police Department, Monday, Dec. 15, 2014, in Oakland, Calif. Demonstrators blocked streets around Oakland police headquarters and chained themselves to the front of the building Monday to protest recent grand jury decisions not to indict white officers who killed unarmed black men in Ferguson, Mo., and New York. (AP Photo/Ben Margot)

    A protestor hangs a banner which reads "Black Lives Matter," atop the flagpole of the Oakland Police Department, Monday, Dec. 15, 2014, in Oakland, Calif. Demonstrators blocked streets around Oakland police headquarters and chained themselves to the front of the building Monday to protest recent grand jury decisions not to indict white officers who killed unarmed black men in Ferguson, Mo., and New York. (AP Photo/Ben Margot)  (The Associated Press)

  • Protestors chained together block the intersection of Broadway and 7th Street in front of the Oakland Police department Monday, Dec. 15, 2014, in Oakland, Calif. Demonstrators blocked streets around Oakland police headquarters and chained themselves to the front of the building Monday to protest recent grand jury decisions not to indict white officers who killed unarmed black men in Ferguson, Missouri, and New York. (AP Photo/Ben Margot)

    Protestors chained together block the intersection of Broadway and 7th Street in front of the Oakland Police department Monday, Dec. 15, 2014, in Oakland, Calif. Demonstrators blocked streets around Oakland police headquarters and chained themselves to the front of the building Monday to protest recent grand jury decisions not to indict white officers who killed unarmed black men in Ferguson, Missouri, and New York. (AP Photo/Ben Margot)  (The Associated Press)

People are blocking streets around Oakland police headquarters after chaining themselves to the front of the building to protest recent grand jury decisions not to indict white officers who killed unarmed black men in Ferguson, Missouri and New York.

Television news footage shows more than a dozen people holding hands and blocking two roads off Interstate 880 in downtown Oakland near the police building Monday morning. The Oakland Tribune reports that more than 50 protesters earlier tried to prevent access to the police headquarters. Some of the protesters had chained themselves to the front doors and a flagpole.

It was not immediately clear whether there were any arrests. Oakland police spokeswoman Johnna Watson said she was checking on the protest.