PARIS, FRANCE - APRIL 20: French security forces cordon the area after a gunman attack, killing a police officer at Champs Elysees in Paris, France on April 20, 2017. One police officer was killed and two others were seriously injured Thursday when a gunman opened fire at a police patrol on the famous Champs-Elysees boulevard here, according to the Interior Ministry. ( Raphael Lafargue - Anadolu Agency )

PARIS, FRANCE - APRIL 20: French security forces cordon the area after a gunman attack, killing a police officer at Champs Elysees in Paris, France on April 20, 2017. One police officer was killed and two others were seriously injured Thursday when a gunman opened fire at a police patrol on the famous Champs-Elysees boulevard here, according to the Interior Ministry. ( Raphael Lafargue - Anadolu Agency )

PARIS, FRANCE - APRIL 20: French security forces cordon the area after a gunman attack, killing a police officer at Champs Elysees in Paris, France on April 20, 2017. One police officer was killed and two others were seriously injured Thursday when a gunman opened fire at a police patrol on the famous Champs-Elysees boulevard here, according to the Interior Ministry. ( Raphael Lafargue - Anadolu Agency )

PARIS, FRANCE - APRIL 20: French security forces cordon the area after a gunman attack, killing a police officer at Champs Elysees in Paris, France on April 20, 2017. One police officer was killed and two others were seriously injured Thursday when a gunman opened fire at a police patrol on the famous Champs-Elysees boulevard here, according to the Interior Ministry. ( Raphael Lafargue - Anadolu Agency )

PARIS, FRANCE - APRIL 20: French security forces cordon the area after a gunman attack, killing a police officer at Champs Elysees in Paris, France on April 20, 2017. One police officer was killed and two others were seriously injured Thursday when a gunman opened fire at a police patrol on the famous Champs-Elysees boulevard here, according to the Interior Ministry. ( Raphael Lafargue - Anadolu Agency )

PARIS, FRANCE - APRIL 20: French security forces cordon the area after a gunman attack, killing a police officer at Champs Elysees in Paris, France on April 20, 2017. One police officer was killed and two others were seriously injured Thursday when a gunman opened fire at a police patrol on the famous Champs-Elysees boulevard here, according to the Interior Ministry. ( Raphael Lafargue - Anadolu Agency )

PARIS, FRANCE - APRIL 20: French security forces cordon the area after a gunman attack, killing a police officer at Champs Elysees in Paris, France on April 20, 2017. One police officer was killed and two others were seriously injured Thursday when a gunman opened fire at a police patrol on the famous Champs-Elysees boulevard here, according to the Interior Ministry. ( Raphael Lafargue - Anadolu Agency )

PARIS, FRANCE - APRIL 20: French security forces cordon the area after a gunman attack, killing a police officer at Champs Elysees in Paris, France on April 20, 2017. One police officer was killed and two others were seriously injured Thursday when a gunman opened fire at a police patrol on the famous Champs-Elysees boulevard here, according to the Interior Ministry. ( Raphael Lafargue - Anadolu Agency )

PARIS, FRANCE - APRIL 20: French security forces cordon the area after a gunman attack, killing a police officer at Champs Elysees in Paris, France on April 20, 2017. One police officer was killed and two others were seriously injured Thursday when a gunman opened fire at a police patrol on the famous Champs-Elysees boulevard here, according to the Interior Ministry. ( Raphael Lafargue - Anadolu Agency )

PARIS, FRANCE - APRIL 20: French security forces cordon the area after a gunman attack, killing a police officer at Champs Elysees in Paris, France on April 20, 2017. One police officer was killed and two seriously injured Thursday evening after a gunman opened fire at a police patrol in the famous Champs-Elysees boulevard in the French capital, according to the Interior Ministry. A man got out of a car and targeted the police directly, Ministry spokesman Pierre Henry Brandet said, adding the driver was believed to be on the loose. ( Yusuf Özcan - Anadolu Agency )

PARIS, FRANCE - APRIL 20: French security forces secure the area after a gunman attack, killing a police officer at Champs Elysees in Paris, France on April 20, 2017. One police officer was killed and two seriously injured Thursday evening after a gunman opened fire at a police patrol in the famous Champs-Elysees boulevard in the French capital, according to the Interior Ministry. A man got out of a car and targeted the police directly, Ministry spokesman Pierre Henry Brandet said, adding the driver was believed to be on the loose. ( Yusuf Özcan - Anadolu Agency )

PARIS, FRANCE - APRIL 20: French security forces secure the area after a gunman attack, killing a police officer at Champs Elysees in Paris, France on April 20, 2017. One police officer was killed and two seriously injured Thursday evening after a gunman opened fire at a police patrol in the famous Champs-Elysees boulevard in the French capital, according to the Interior Ministry. A man got out of a car and targeted the police directly, Ministry spokesman Pierre Henry Brandet said, adding the driver was believed to be on the loose. ( Yusuf Özcan - Anadolu Agency )

PARIS, FRANCE - APRIL 20: Two women run as police officers take security measures after a gunman attacked, killing a police officer at Champs Elysees in Paris, France on April 20, 2017. One police officer was killed and two seriously injured Thursday evening after a gunman opened fire at a police patrol in the famous Champs-Elysees boulevard in the French capital, according to the Interior Ministry. A man got out of a car and targeted the police directly, Ministry spokesman Pierre Henry Brandet said, adding the driver was believed to be on the loose. ( Raphael Lafargue - Anadolu Agency )

PARIS, FRANCE - APRIL 20: Police officers take security measures after a gunman attacked, killing a police officer at Champs Elysees in Paris, France on April 20, 2017. One police officer was killed and two seriously injured Thursday evening after a gunman opened fire at a police patrol in the famous Champs-Elysees boulevard in the French capital, according to the Interior Ministry. A man got out of a car and targeted the police directly, Ministry spokesman Pierre Henry Brandet said, adding the driver was believed to be on the loose. ( Raphael Lafargue - Anadolu Agency )

PARIS, FRANCE - APRIL 20: Police officers take security measures after a gunman attacked, killing a police officer at Champs Elysees in Paris, France on April 20, 2017. One police officer was killed and two seriously injured Thursday evening after a gunman opened fire at a police patrol in the famous Champs-Elysees boulevard in the French capital, according to the Interior Ministry. A man got out of a car and targeted the police directly, Ministry spokesman Pierre Henry Brandet said, adding the driver was believed to be on the loose. ( Raphael Lafargue - Anadolu Agency )