Met Police bosses have warned about the threat from terrorism this festive season after the deadly attack on a Christmas market in Germany . A nine-year-old boy and four adults were killed when a car ploughed through a crowd of Christmas revellers in Magdeburg on Friday. Another 200 people were left injured, and authorities say the death toll is likely to rise. The suspect, named by German media as Taleb al-Abdulmohsen, is a 50-year-old psychiatrist from Saudi Arabia who moved to Germany in