A police operation is under way in Paris around the Champs Elysees area, amid reports of a car on fire.
Local media say a man has been detained. It is not yet clear what led to the heavy police presence.
France is currently in a state of emergency after being hit by a wave of deadly terror attacks in recent years.
A policeman was shot dead and two others were wounded in an attack on the Champs Elysees in April, just days before the presidential election.
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