Migrant crisis: 'Immense queue' at Serbia-Croatia border

BBC reporter John Sweeney is on the refugee trail searching for a young Syrian boy, Azam.

When they met last month in Serbia, Azam had a broken jaw and had been sent to hospital for treatment. Then he vanished.

As part of the search for Newsnight, Sweeney passed the Serbia-Croatia border, where he filmed the vast numbers of people waiting to cross over.

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