Since the million-strong influx of migrants into Germany last year, authorities there have struggled to deport failed asylum seekers from Tunisia, Morocco and Algeria when their home countries refuse to take them back.
The issue has been put into sharp focus by the massive manhunt for Anis Amri, the 24-year-old Tunisian who Chancellor Angela Merkel confirmed on Thursday is the alleged perpetrator of the truck attack on a Christmas market in Berlin that claimed 12 lives.
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