In Picture: A Look at Europe's Migrant Crisis
Europe Migrant Crisis - Sept. 20, 2015

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Migrants are escorted by Hungarian police officers as they walk towards the railway station in Zakany, 230 kms southwest of Budapest, Hungary, after they crossed the border from Croatia.

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A Syrian refugee boy cries while he and his family try to board a train at the station in Tovarnik, Croatia. Police said more people are coming in from Serbia, mostly near the eastern border town of Tovarnik, where there are already around 2,500 people waiting for transport.

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Migrants and refugees board a train by climbing through the windows as they try to avoid a police barrier at the station in Tovarnik.

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Croatian riot police officers try to clear a railway track after thousands of refugees broke a police line to board a train at the station in Tovarnik.