A gunman has killed a police officer and wounded another before being killed himself in an attack on the Champs-Elysees shopping district, Paris police say.
Paris police spokeswoman Johanna Primevert told reporters the attacker targeted police guarding the area near the Franklin Roosevelt subway station on Thursday night (local time) at the centre of the avenue, which is popular with tourists.
The person who fired on police has been killed.
Witnesses reported a helicopter flying low over central Paris, apparently part of a follow-up police operation.
Police authorities called on the public to avoid the area.
France goes to the polls on Sunday in the first round of a closely fought presidential election.
There is still no word on the identity or motivation of the gunman but jihadism has been a major issue in the campaign.
France has lived under a state of emergency since 2015 and has suffered a spate of Islamist militant attacks that have killed more than 230 people in the past two years.
Earlier this week, two men were arrested in Marseille whom police said had been planning an attack ahead of the election.
A machine gun, two hand guns and three kilograms of TATP explosive were among the weapons found at a flat in the southern city along with jihadist propaganda materials according to the Paris prosecutor.
More to come.