At 21:00 GMT on Thursday night a man pulled his auto alongside a bus transporting French police on the heavily-transited Champs-Elysees in Paris, opening fire with an automatic weapon and killing one of the officers.
French police are also hunting for a man who has been identified by Belgian security services, an interior ministry spokesman says. The prime minister said the government has reviewed its already extensive election security measures and says it is "fully mobilized" for Sunday's vote.
Authorities are investigating an attack by a gunman who opened fire on police on Paris' iconic Champs-Elysees boulevard Thursday night, killing one officer and wounding three people before police shot and killed him.
A note praising Islamic State (IS) was found near the body of the 39-year-old French attacker, who shot dead one officer and wounded two others before being killed by police.
France is in a state of emergency and at its highest possible level of alert since a string of Islamist militant attacks that began in 2015, which have killed over 230 people.More news: Samsung says Galaxy S8 pre-orders beat S7
Paris prosecutor François Molins said shortly after the shootings that "the attacker's identity is known and has been verified".
A property being searched in the eastern Paris suburb of Chelles is understood to be his home, according to a police document seen by the Associated Press news agency.
Security has been tight in the country, coming just days before the first round of France's presidential election on Sunday.
He was shot dead in return fire while trying to escape, police sources said.
Another witness identified only as Ines told French broadcaster BFM TV that she heard a shooting, saw a man's body on the ground and the area was quickly evacuated by police.More news: UN Security Council condemns North Korea missile test
Belgian officials had warned French authorities before the attack that El Osri was a "very risky individual en route to France" aboard a high-speed train.
NPR's Eleanor Beardsley reports from the Champs Elysees that the avenue has been completely cordoned off. "People are not allowed on it anymore".
France's interior ministry said the suspect had walked in to a police station in Antwerp, Belgium. Belgian authorities said they had no information about the suspect. "It's a awful thing that's going on in the world today".
Mr Macron, the front runner for the presidency, said candidates in the election should avoid one-upmanship following the attack and urged France not to "yield to fear, division and intimidation".More news: Samsung To Launch Galaxy S8 And S8 Plus In India Today
The attacks were claimed by Daesh, which is mainly active in Syria and Iraq.
- Teacher accused of kidnapping student due in court
- Ichiro hits home run in potential final at-bat in Seattle
- How the Samsung Galaxy S8's Camera Compares to the iPhone 7 Plus
- Four Adjustments For Hawks Going Into Game 2
- Paris Shooting: Why it could actually help Emmanuel Macron
- Bill O'Reilly Out, Georgia Runoff, Turkish Vote46:37
- Trump says Iran violating 'spirit' of nuclear deal
- Jazz's Gobert to miss Game 3 vs Clippers with knee injury
- Bill Murray To Release Debut Album This Year
- French candidate publicizes Obama call before Sunday vote