“A five-hour killing rampage in Brazil’s southeastern city of Campinas that left 12 people dead is being investigated amid claims it may have been sparked by the earlier death of a police officer. The 12 victims were gunned down in several separate incidents on the outskirts of the city, in what Brazilian media said appeared to be execution-style killings.”
Source: Brazil killing spree leaves 12 dead, sparks suspicion over police role – CNN.com