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Mayor of Berlin Michael Mueller (front C) delivers a speech during commemoration for the 1st anniversary of the attack on a Christmas market at Breitscheidplatz of Berlin, capital of Germany, on Dec. 19, 2017. (Xinhua/Shan Yuqi)
Mayor of Berlin Michael Mueller (front C) delivers a speech during commemoration for the 1st anniversary of the attack on a Christmas market at Breitscheidplatz of Berlin, capital of Germany, on Dec. 19, 2017. (Xinhua/Shan Yuqi)