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PARIS, FRANCE - APRIL 20:  Police officers secure the area after a gunman opened fire on Champs Elysees on April 20, 2017 in Paris, France. One police officer has been killed, and a second injured by a gunman on The Champs Elysees. Security is heightened in Paris with the first round of France's presidential election on Sunday.   (Photo by Jeff J Mitchell/Getty Images)
PARIS, FRANCE - APRIL 20:  Police officers secure the area after a gunman opened fire on Champs Elysees on April 20, 2017 in Paris, France. One police officer has been killed, and a second injured by a gunman on The Champs Elysees. Security is heightened in Paris with the first round of France's presidential election on Sunday.   (Photo by Jeff J Mitchell/Getty Images)

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Gunman opens fire on police in Paris

On April 20, a gunman opened fire on police, killing one police officer and injuring others. He was later killed by police.

Gunman opens fire on police in Paris

On April 20, a gunman opened fire on police, killing one police officer and injuring others. He was later killed by police.