Assailant killed one person and injured four others before he was shot dead by police
ISIS claims knife attack in Paris
ISIS has claimed responsibility for a knife attack in central Paris on Saturday.
The knifeman, shouting "Allahu Akbar", was shot dead by police after he killed one person and injured four, prompting investigations into a suspected terror attack.
French President Emmanuel Macron tweeted that the country has "once again paid in blood, but will not give an inch to the enemies of freedom".
Mr Macron also praised officers for "neutralising the terrorist".
The attack took place near the city's main opera house in an area full of bars, restaurants and theatres which were busy on a weekend night.
The man attacked five people with a knife, one of whom died, police said. Two remain in a serious condition.
ISIS claimed responsibility for the attack on Saturday in a post via its Amaq News Agency, but provided no proof of its involvement.
Witnesses described to French media how they saw the assailant running towards police officers who shot him.
"We were told to get into a bar quickly. I was curious and went outside again. Outside, I saw a person on the ground about 200 metres from me. The police, fire brigade and ambulance arrived," one woman told LCI television. "I could not see anything else after that."
French interior minister Gerard Collomb called it an "odious" attack. In a tweet he hailed the "reaction of the police who neutralised the attacker".
France is under a constant threat from terrorism. A series of attacks have claimed the lives of more than 245 people in the past three years.