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The suspect in a deadly knife attack in central Paris on Saturday evening was born in 1997 in the Russian republic of Chechnya, a judicial source says.
The attacker killed a 29-year-old man and wounded four other people in the busy Opéra district before being shot dead by police.
The suspect had shouted "Allahu Akbar" (God is greatest), witnesses said.
So-called Islamic State (IS) later said one of its "soldiers" had carried out the attack.
The judicial source told French media the suspect had no criminal record and that his parents had been held for questioning. Another source told Reuters the suspect was not previously known to police.
Interior Minister Gérard Collomb said the victim of the attack was a 29-year-old passer-by, but gave no further details.
The attacker began stabbing passers-by at about 21:00 local time (19:00 GMT).
Eyewitnesses described him as a young man with brown hair and a beard, dressed in black tracksuit trousers.
The man tried to enter several bars and restaurants but was blocked by people inside. Police arrived at the scene within minutes.
They first tried to stop the assailant with a stun-gun before shooting him dead.
An eyewitness, named as Gloria, told AFP news agency: "We didn't know what was going on, we were quickly moved inside the bar, I went outside and I saw a man lying on the floor."