Forensic experts investigate the crime scene after a fatal shooting in which a police officer was killed along with an attacker 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/Kamil Zihnioglu)
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