A second suspect in the Paris attack on Thursday night has turned himself over to Belgian police after France was alerted about a potential accomplice.

"The man in the wanted notice issued by Belgian authorities presented himself to a police station in Antwerp," ministry spokesman Pierre-Henry Brandet told AFP.

"It is too early to say" if the man signalled by Belgium was involved in the shooting which killed a policeman and wounded two others on the Champs-Elysées on Thursday, Brandet told Europe 1.

Further details about the suspect remain unknown.

The gunman killed one police officer before being shot dead by security forces.

The Champs-Elysées, one of the busiest areas in the city, was in lockdown after the shooting, leaving Parisians and tourists alike trapped in restaurants and hotels.

Brandet said that the police officers "avoided a blood bath".

The gunman was already known to police and had a long history of violence towards police officers.

Prime Minister Bernard Cazeneuve said security forces, including elite units, were fully mobilised ahead of Sunday's presidential poll.

"Nothing must be allowed to impede the fundamental democratic process of our country," he said after an emergency security cabinet meeting.

Islamic State (Isis) has said one of its "fighters" carried out the attack.