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CALAIS, FRANCE - APRIL 18 : Migrants camped out in Calais, are seen at Calais forests, France on April 18, 2015. More than 2 thousands migrants waiting at Calais forests, hoping to get to Britain, camp out in Calais, France on April 18, 2015. (Photo by Mustafa Yalcin/Anadolu Agency/Getty Images)

CALAIS, FRANCE - APRIL 18 :  Migrants camped out in Calais, are seen at Calais forests, France on April 18, 2015. More than 2 thousands migrants waiting at Calais forests, hoping to get to Britain, camp out in Calais, France on April 18, 2015. (Photo by Mustafa Yalcin/Anadolu Agency/Getty Images)