A police officer guards the entrance to a Christmas market in Magdeburg, Germany, Tuesday Dec. 20, 2016, one day after a truck ran into a crowded Christmas market in Berlin killing several people. ( Peter Gercke/dpa via AP)
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A police officer guards the entrance to a Christmas market in Magdeburg, Germany, Tuesday Dec. 20, 2016, one day after a truck ran into a crowded Christmas market in Berlin killing several people. ( Peter Gercke/dpa via AP)
