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Police officers stand guard on Champs Elysees shopping street in Paris, France on April 20, 2017. One policeman was killed, and another severely injured in a shooting incident Thursday evening near the Champs Elysees shopping street in Paris. (Xinhua/Chen Yichen)

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Police vehicles block the Champs Elysees shopping street in Paris, France on April 20, 2017. One policeman was killed, and another severely injured in a shooting incident Thursday evening near the Champs Elysees shopping street in Paris. (Xinhua/Chen Yichen)

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French gendarmerie stand guard on Champs Elysees shopping street in Paris, France on April 20, 2017. One policeman was killed, and another severely injured in a shooting incident Thursday evening near the Champs Elysees shopping street in Paris. (Xinhua/Chen Yichen)

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Police officers patrol on Champs Elysees shopping street in Paris, France on April 20, 2017. One policeman was killed, and another severely injured in a shooting incident Thursday evening near the Champs Elysees shopping street in Paris. (Xinhua/Chen Yichen)