The assailant behind the Saturday night knife attack in Paris has been identified as a Chechnya-born French national, judicial sources revealed on Sunday. The unnamed attacker was born in the Chechnya region of Russia in 1997. The 21-year-old’s father and mother are being held for questioning by police, a judicial source said. On Saturday, the assailant killed a passer-by and wounded four other people in the busy Opera district of central Paris at around 9:30 p.m., before being shot dead by police, witnesses and the Paris prosecutor said. He was categorized in France as “fiche S”, an indication used by law enforcement officials to flag people who may be a threat to national security, said another source close to the investigation. Investigators have not yet said when the man arrived in France. The ISIS terrorist group claimed responsibility for Saturday’s the attack. Earlier, Interior Minister Gerard Collomb told reporters the injured were out of danger. “I have seen the person who was seriously injured. She is recovering. She was operated on and saved,” he said after visiting the victims in hospital. France “will not yield an inch to the enemies of freedom,” President Emmanuel Macron said shortly after the attack, praising police officers for “neutralizing the terrorist”. Police union representative Rocco Contento told Reuters that the assailant, after attacking bystanders with a knife, rushed at police shouting “I will kill you, I will kill you!” He was then shot by the officers. The attack took place in the heart of the French capital, in a district popular with tourists for its many restaurants and cafes, landmark retail stores, and the Paris opera. A picture seen by Reuters, which a source said showed the attacker, showed a bare-chested and bearded young man dressed in black trousers. A source told Reuters the attacker was not previously known to police. ISIS claimed responsibility for the attack via its Amaq news agency, but provided no proof for its claim. Authorities have not revealed the identity of the person killed in Saturday’s attack, but the judicial source said he was a man aged 29. Many but not all of the people on Frances S file (the S stands for security) have been involved in the series of deadly extremist attacks that have killed some 245 people across the country since 2015. The watchlist contains anyone suspected of being a radical, including potentially dangerous religious extremists but also leftist and far-right activists. A separate list, the File for the Prevention of Terrorist Radicalization (FSPRT), focuses on people judged to be terror threats. That list currently has nearly 20,000 people, of whom about half are under active surveillance.