We meet former Afghan soldiers and police attempting to cross into Turkey after travelling through Iran.

Turkish authorities have stepped up security on their border and warned they won't accept an influx of Afghan migrants and refugees.

Turkey already has the world's largest refugee population of around 4 million people, 3.6 million of whom are Syrians.

Many Afghans cross Iran to get to Turkey, hoping to travel onwards to Europe. Turkey says it has stopped 90,000 people from crossing the border so far this year.

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