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A police officer walks past activists of NGO “Rio da Paz” who are attending a demonstration in solidarity with relatives of victims of the 18 people killed last week at Paulista Avenue in Sao Paulo's financial centre, Brazil, August 20, 2015. Brazilian police are investigating whether a string of 18 murders in metropolitan Sao Paulo on August 13 night were a coordinated act of revenge by off-duty officers following the nearby deaths of two colleagues in the previous week. The banner reads “Who killed the 18?”. (Photo by Paulo Whitaker/Reuters)
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