Police seal off the Champs Elysees avenue in Paris, France, after a fatal shooting in which a police officer was killed along with an attacker, Thursday, April 20, 2017. An attacker with an automatic weapon opened fire on police on Paris' iconic Champs-Elysees Thursday night, killing one officer and seriously wounding two others before police shot and killed him. (AP Photo/Thibault Camus)

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