Policemen pass by a burnt bus
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Brazil police investigated over three-hour killing spree in Campinas

14 January 2014 Last updated at 02:10 GMT

An investigation is under way in Brazil to find out whether a group of policemen went on a three-hour killing spree in an alleged revenge attack.

Twelve people were killed overnight by gunmen in vehicles in a district of Campinas, a city north of Sao Paulo.

The BBC's America's editor Leonado Rocha reports.