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ZAGREB, SLOVENIA - OCTOBER 18: Refugees get out of a train in Zagreb, Slovenia on October 18, 2015. Refugees fleeing war zones - most in Syria and Iraq - have begun to enter Slovenia by train and bus after Hungary closed its Croatian border with barbed wire. (Photo by Stipe Mayic/Anadolu Agency/Getty Images)

ZAGREB, SLOVENIA - OCTOBER 18: Refugees get out of a train in Zagreb, Slovenia on October 18, 2015. Refugees fleeing war zones - most in Syria and Iraq - have begun to enter Slovenia by train and bus after Hungary closed its Croatian border with barbed wire. (Photo by Stipe Mayic/Anadolu Agency/Getty Images)