"Hundreds of protesters have taken to streets in the US city of Oakland to oppose a court ruling on a white police officer's killing of an unarmed African-American.
The protest turned violent on Thursday night, with the demonstrators throwing rocks and bottles at police. At least 50 people have been arrested for fighting with the police.
Former Bay Area Rapid Transit officer Johannes Mehserle was found guilty of "involuntary manslaughter" of Oscar J. Grant III, on New Year's Day of 2009."
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