At least 13 protesters were arrested Monday in Oakland as they blocked downtown roads in a protest against recent police killings.

Protesters chained shut the main entrances of the Oakland police agency's headquarters according to Yahoo! Police say protesters prevented people from getting into the buildings while one other demonstrator climbed a flagpole.

Officers were set to make more arrests even after the blocked doors were cleared by 10:30 Monday morning.

The AP reported that demonstrators held a sign that said, "End the War on Black People." One of the protesters told KTVU-TV that, "It's not OK, black lives matter."

"We fight for justice for every single black life that has passed at the hands of police," one of the protest organizers, Dierdre Smith told NBC. "But we must also stand up and shut down for the black and breathing who are at risk of the same fate."

Smith is part of "The Black Collective" movement consisted of all black members who protest for the justice of recent victims of police brutality and other black people who have been killed by police officers.

The group statements said that they wanted members of the black community to lead the fight of recent protests that sometimes grew violent and that may have been taken over by white participants.

A group called #Asians4BlackLives also joined the members in their protest.

Dozens of protesters were marching peacefully and some holding signs that read, "Black and Breathing."

"This action is part of a larger, sustained effort to disrupt business as usual in the tradition of the Montgomery Bus Boycott and the Woolworth counter sit-ins," said Jeralynn Blueford, mother of Alan Blueford, a man who was killed by an Oakland police officer in 2012.

Protesters filled the streets in many cities throughout the U.S. in response to recent decisions to not indict white officers who killed an unarmed black teen in Missouri and an unarmed black man in New York.