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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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Paris opens terror probe after officer killed

Paris is now looking into the possibility of terror behind the deadly shooting of a police officer. CNN's Melissa Bell reports.

Paris opens terror probe after officer killed

Paris is now looking into the possibility of terror behind the deadly shooting of a police officer. CNN's Melissa Bell reports.