Los Angeles police have arrested 15 people who blocked a downtown railroad track and halted a commuter train during a protest against police brutality.
Metro suspended its Blue Line service for about two hours Tuesday evening.
Police declared an unlawful assembly and moved in after protesters sat down on the tracks as a train waited nearby.
In San Francisco, about 30 demonstrators walked along a main avenue holding signs against police violence. Two lines of police officers walked along with the march that started outside City Hall.
In Oakland, some protesters tried to block Interstate 880 but officers quickly cleared the area.
The protests are among several being held in U.S. cities in the wake of police shootings of unarmed people.