Two policemen have been wounded in a shooting on the Champs Elysees in Paris, French media say.
Some reports say the gunman who fired on them has been killed by police. The Champs Elysees has been sealed off.
France goes to the polls on Sunday in the first round of the presidential election.
There is no word on the identity of the gunman. Jihadism is a major issue in the vote after attacks claimed by so-called Islamic State.
This breaking news story is being updated and more details will be published shortly via BBC.com and WOOD Radio.