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©Matthias Oesterle/ZUMAPRESS.com/MAXPPP - September 29, 2018 - Catalonia, Spain - Catalan riot police agents stand guard as they are colored by paint bags thrown from pro-independence activists protesting agsinst s demonstrstion of Police officers of the National Police and Civil Guard marching through Barcelona to pay homage to the participants of last years 'operacion copernico', a massive police deployment within the Catalan secession referendum at October 1st, and to protest for a salary equality with the regional police forces