Refugee border crisis: Thousands of Polish troops deployed

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Belarus is accused of deliberately sending thousands of migrants across the border to provoke a confrontation with the European Union. They're now trapped in freezing conditions. We have a report from the Afghan town of Zaranj, close to the borders of both Pakistan and Iran - now a people smuggling hub as more people try to leave the country. And the incredible story of the bionic teacher - brought back into the classroom by her own students.