Authorities in Northern California arrested at least 19 people as protesters angered by the killings of unarmed black men by white police officers rallied for a fourth night.
Protesters stopped at City Hall, where a city councilman addressed the crowd and said he will ask for an investigation into police response to the protests over the weekend, when the latest wave of protests started.
Bay Area Rapid Transit officials said the station in downtown Berkeley was closed as a precaution. A City Council meeting scheduled for Tuesday night was canceled after threats to disrupt it, said Berkeley Mayor Tom Bates.
A California Highway Patrol official said 80 percent off its available staff would be deployed to monitor the protest in Berkeley after a crowd of about 1,500 blocked all lanes of Interstate 80 and blocked an Amtrak train Monday night.
The agency arrested 223 people Monday on suspicion of resisting arrest, obstructing police and other charges, said Ernie Sanchez, assistant chief of the CHP's Golden Gate Division. Berkeley police arrested another nine people.
KNTV reports that Berkeley police arrested five adults and one juvenile Tuesday night and the California Highway Patrol apprehended an additional 13.
Those arrested face bails of up to $50,000, and many remain in custody, he added.
The San Francisco Chronicle reports that the protests became sporadically destructive over several hours.
Organizers of a demonstration planned for Wednesday morning in Oakland said they expect hundreds of people to come out and help shut down a federal building.
A large group of demonstrators destroyed highway perimeter fencing, flooded lanes, and threw rocks and other objects at officers, Tuesday. It took about an hour and a half to clear the interstate, and no major injuries were reported, the CHP said.
A woman stuck in traffic went into labor during the protest, but fire crews were able to get her to a hospital, KPIX-TV reported.
"The CHP respects the public's right to gather and demonstrate, but it needs to be done in a safe manner," Sanchez said. "At this point, they've made their statement and we respect that. Now, we're asking them to stop."
Although many activists in other parts of the country have gone home, protests in Berkeley and Oakland are still active, reflecting the area's long history of protest dating to the 1960s.
The protests started after a grand jury on Nov. 24 declined to indict Officer Darren Wilson in the killing of Michael Brown in Ferguson, Missouri. A New York grand jury on Dec. 3 declined to prosecute a police officer captured on video applying a fatal chokehold on Eric Garner. That decision set off more demonstrations nationwide.