One person has been killed and four wounded in a knife attack in central Paris, French police say.
The attacker was shot dead by officers in the Opéra district. Two of the injured are in a serious condition.
The attack took place on Saturday evening in an area with a vibrant nightlife and popular with tourists.
Eyewitnesses spoke of panic, as people ran for cover in restaurants and cafes. The motive for the attack was not immediately known.
The witnesses say police first tried to taser the attacker – but then fired two shots after this failed, France24 reports.
French Interior Minister Gérard Collomb praised police for their “cool response”. He said his first thoughts were “with the victims of this heinous act”.
“I want to tell them that all Parisians are on their side,” she added.
French police warned the public not to spread rumours.
France has been on high alert following a series of attacks over the past three years. Some have been claimed or inspired by so-called Islamic State (IS).
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