Forensic experts collect evidences from the car belonging to an attacker who killed a police officer on the Champs Elysees avenue in Paris, France, Friday, April 21, 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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