Newspapers report that a waiter guarding windows at a restaurant was hit in the face with a hammer late Monday night, and protesters threw fireworks at police in riot gear. Police deployed flash-bang grenades.
Police spokeswoman Johnna Watson says the arrests were for crimes including assault with a deadly weapon and vandalism.
The Oakland Tribune reports that the waiter's co-workers were helping him ice his head as they waited for an ambulance.
Witnesses told the newspaper that a protester was also injured when he was struck by a police projectile. Police did not immediately respond to a request to confirm or deny that report.
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