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A line of riot police officers, left, charge on demonstrators as a riot police, right, raises his baton over protester falling to the ground, in downtown Bogota, Colombia, Thursday, Aug. 29, 2013. Students protesting in support of farmers who have been blockading Colombian highways for more than ten days for a laundry list of demands that include reduced gasoline prices, increased subsidies and the cancellation of free trade agreements.

Fernando Vergara / AP