Burned vehicles in Campinas after the killings that started with a policeman's murder. Photo: AFP

12 shot dead in violence in Brazilian city Campinas after policeman killed

A wave of shootings near Brazil's technology hub left at least 12 dead with investigators questioning whether police were acting in revenge for the death of a colleague

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Burned vehicles in Campinas after the killings that started with a policeman's murder. Photo: AFP
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