A police officer aims his shotgun at demonstrators during clashes after a protest for missing activist Santiago Maldonado, in Buenos Aires, Argentina, Friday, September 1, 2017. Human rights groups say Maldonado went missing a month ago today, after Argentine border police captured him during an operation against Mapuche Indians who were blocking a highway in Argentina's Patagonia. (Photo by Joaquin Salguero/AP Photo)
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