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A policeman inspects the Hagley Park, where a national remembrance service was held to pay tribute to the victims of the Christchurch terror attacks, in Christchurch, New Zealand, on March 29, 2019. (Xinhua/Zhu Qiping)

A policeman inspects the Hagley Park, where a national remembrance service was held to pay tribute to the victims of the Christchurch terror attacks, in Christchurch, New Zealand, on March 29, 2019. (Xinhua/Zhu Qiping)