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Members of the Polisario Front stand guard during a visit of the United Nations chief on March 5, 2016, in Bir-Lahlou, in the disputed territory of Western Sahara, situated 220 kilometres (137 miles) southwest of the Algerian town of Tindouf. UN Secretary General Ban Ki-Moon, who met Polisario Front leaders including its Secretary General, said he would "spare no effort" in trying to find a solution to the Western Sahara issue. / AFP / Farouk Batiche (Photo credit should read FAROUK BATICHE/AFP/Getty Images)

Members of the Polisario Front stand guard during a visit of the United Nations chief on March 5, 2016, in Bir-Lahlou, in the disputed territory of Western Sahara, situated 220 kilometres (137 miles) southwest of the Algerian town of Tindouf.
UN Secretary General Ban Ki-Moon, who met Polisario Front leaders including its Secretary General, said he would "spare no effort" in trying to find a solution to the Western Sahara issue. / AFP / Farouk Batiche        (Photo credit should read FAROUK BATICHE/AFP/Getty Images)