Germans have been urged not to scapegoat migrants, after an Afghan youth was arrested over the rape and murder of a German student. A 17-year-old Afghan boy is under suspicion because a DNA test appears to link him to the spot in Freiburg where the woman was attacked in October. Vice Chancellor Sigmar Gabriel warned Germans not to exploit the crime "for incitement and conspiracy propaganda". Last year's massive influx of migrants fuelled tensions over immigration. The 19-year-old medical student disappeared in mid-October on her way home from a party in Freiburg, south-western Germany. Her body was found in the...