caption: FILE -- In this Dec. 20, 2016 file photo the trailer of a truck, left, stands beside destroyed Christmas market huts in Berlin, the day after a truck ran into a crowded Christmas market. German prosecutors say they've detained a Tunisian man they think may have been involved in last week's truck attack on a Christmas market in Berlin. Federal prosecutors said Wednesday Dec. 28, 2016 the 40-year-old was detained during a search of his home and business. (AP Photo/ <PERSON>,file)
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