Armed police have blocked off the Champs Elysees in Paris after an officer was killed and another wounded in a shooting.
A report citing a police source said the person who fired on officers had been killed in turn.
There were at least two attackers and police said the shooting was very probably a "terrorist act".
Police urged people to avoid the area.
A witness identified only as Ines told French television station BFM that she heard a shooting, saw a man's body on the ground and the area was quickly evacuated by police.
This is a developing story and we will have more as it unfolds.