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Croatian police officers round-up migrants and refugees near the village of Tovarnik, close to the official Serbia-Croatia border on September 16, 2015. Migrants and refugees began to cross from Serbia into Croatia, desperate to find a new way into the European Union after Hungary sealed its border and a string of EU countries tightened frontier controls in the face of an unprecedented human influx. AFP PHOTO / ALEXA STANKOVICALEXA STANKOVIC/AFP/Getty Images
Croatian police officers round-up migrants and refugees near the village of Tovarnik, close to the official Serbia-Croatia border on September 16, 2015. Migrants and refugees began to cross from Serbia into Croatia, desperate to find a new way into the European Union after Hungary sealed its border and a string of EU countries tightened frontier controls in the face of an unprecedented human influx. AFP PHOTO / ALEXA STANKOVICALEXA STANKOVIC/AFP/Getty Images

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    Migrants must make their own way into Europe

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Migrants must make their own way into Europe

Migrants trying to get into Europe from the Middle East must often improvise and make their own routes. CNN's Ivan Watson walks one of those routes with them.

Migrants must make their own way into Europe

Migrants trying to get into Europe from the Middle East must often improvise and make their own routes. CNN's Ivan Watson walks one of those routes with them.