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IDOMENI, GREECE - AUGUST 21: Migrant families try to cross an illegal crossing point on the border between Greece and Macedonia as Macedonian police officers form a blockade in the town of Idomeni on August 21, 2015 in Idomeni, Greece. A "state of emergency" has been declared as an influx of migrants try to cross the Macedonian-Greek border. (Photo by Milos Bicanski/Getty Images)

IDOMENI, GREECE - AUGUST 21: Migrant families try to cross an illegal crossing point on the border between Greece and Macedonia as Macedonian police officers form a blockade in the town of Idomeni on August 21, 2015 in Idomeni, Greece. A "state of emergency" has been declared as an influx of migrants try to cross the Macedonian-Greek border. (Photo by Milos Bicanski/Getty Images)