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Two policemen stand guard in front of the Brandenburg Gate in Berlin, capital of Germany, on Dec. 29, 2017. Several German cities have announced tight security measures in preparation for their respective New Year's Eve celebrations this weekend. (Xinhua/Shan Yuqi)

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Policemen gather near the Brandenburg Gate in Berlin, capital of Germany, on Dec. 29, 2017. Several German cities have announced tight security measures in preparation for their respective New Year's Eve celebrations this weekend. (Xinhua/Shan Yuqi)

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A police vehicle is seen in front of the Brandenburg Gate in Berlin, capital of Germany, on Dec. 29, 2017. Several German cities have announced tight security measures in preparation for their respective New Year's Eve celebrations this weekend. (Xinhua/Shan Yuqi)

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Two soldiers stand guard at Spanish Square in Rome, Italy, on Dec. 29, 2017. Security has been tightened in Rome in preparation for New Year's Eve celebrations this weekend. (Xinhua/Jin Yu)

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A soldier stands guard at Venice Square in Rome, Italy, on Dec. 29, 2017. Security has been tightened in Rome in preparation for New Year's Eve celebrations this weekend. (Xinhua/Jin Yu)

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A soldier stands guard at Venice Square in Rome, Italy, on Dec. 29, 2017. Security has been tightened in Rome in preparation for New Year's Eve celebrations this weekend. (Xinhua/Jin Yu)

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