While May Day rallies around the Bay unfolded peacefully with speeches and car caravans to honor workers’ rights and the labor movement, an anti-police demonstration in downtown Oakland Saturday night grew tense, resulting in the arrests of multiple people in connection with assaulting police officers and injuring a TV news employee.

Oakland police tweeted just after 9 p.m. that one person was arrested in connection with the assault on the officer that took place at 2nd and Castro streets, near Jack London Square. No further details were released about the alleged assault or the person arrested.

Just after 10 p.m. police announced they had arrested the driver of a silver BMW that crashed into a KPIX-Channel 5 news van at 14th and Jefferson streets. The BMW’s driver ran from the scene, but officers located the driver a block away and made an arrest. The driver of the news van was injured and transported to a local hospital. Information about the injured driver’s condition was not available as of late Saturday night.

Then, shortly after 10:30 p.m., police tweeted that they had arrested an unspecified number of individuals for assaulting officers.

Social media posts Saturday night showed a large police presence, starting near Jack London Square and then at Frank H. Ogawa Plaza near Oakland City Hall, which activists call Oscar Grant Plaza.

A group, calling to “abolish the police,” had invited people to join a demonstration to start at Ogawa Plaza at 8 p.m.

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This was several hours after a coalition of labor and other activist groups led a car caravan through downtown Oakland to promote their support of workers’ rights and racial justice. The caravan stopped outside Whole Foods Market where Hashid Kasama, an employee for the grocery-delivery service Instacart, spoke in favor of the The Pro Act, which would provide protections to workers trying to organize, according to a social media post.

Across the bay in San Francisco, Angela Davis and other activists spoke in front of rally of more than 1,000 people at Civic Center in honor of May Day, or International Workers’ Day, as it’s known worldwide. In San Jose, there was a march along Santa Clara Street to City Hall.

The City of Oakland had alerted the public earlier this week that there would be a large police presence downtown Saturday night, out of concern that people could be planning to cause property damage or stoke violence.

“Like many cities across the country, the City of Oakland is aware of several planned peaceful events, which the city welcomes and will support,” the letter said.

“In anticipation of this Saturday’s events, the Oakland Police Department will have more officers ready for deployment,” the letter continued. “OPD is prepared to facilitate peaceful demonstrations and create safe places and spaces for first amendment rights. The department will take enforcement action for those who participate in violence against others, damage of property, and destruction.”