Police on Sunday scoured the background of a Frenchman born in Russiaâ€™s Chechnya region who killed one man in a knife attack in Paris as the government said the 21-year old had been flagged previously as a potential security risk.
The assailant, who has not yet been formally identified, shouted â€œAllahu akbarâ€ (God is greatest) as he began his stabbing rampage. He fatally knifed a 29-year-old man and wounded four others, among them a Chinese and a Luxembourg citizen, before police shot him dead, officials said.
The attack took place in the bustling Opera district, known for its many restaurants, cafes and the Palais Garnier opera.
It was the latest in a succession of attacks in France since January 2015 in which more than 240 people have died.
The attacker had since 2016 been on a counter-terrorism watchlist of suspected radicals who may be a threat to national security, government spokesman Benjamin Griveaux said.
The stabbing exposed once again the difficulty European intelligence services face keeping track of suspected extremists and countering the threat posed by homegrown militants and foreign jihadists.
France has participated in a U.S.-led coalition battling Islamic State in Iraq and Syria, and it also intervened in Mali to push back an Islamist rebellion in the West African state.
Its military interventions overseas have exposed it to attack by Islamist militants at home.
The assailant became French when his mother obtained citizenship in 2010, Griveaux said in a joint interview with broadcasters LCI and RTL and newspaper Le Figaro.
He rejected criticism from opponents of President Emmanuel Macron that the government was not doing enough to stem such attacks, saying: â€œZero risk does not exist.â€
Islamic State claimed responsibility for the attack, but provided no proof. Griveaux said the claim had not yet been fully authentified.
Macron said France would â€œnot yield an inch to the enemies of freedom,â€ and praised police for â€œneutralizing the terroristâ€.
A judicial source said the assailantâ€™s parents were being held for questioning.
Police union representative Rocco Contento told Reuters the attacker had rushed at police on Saturday evening, shouting â€œI will kill you, I will kill you!â€ after stabbing bystanders.
He was then shot by the officers.
â€œIt was scary,â€ said Emma Klibbe, a 32-year old Australian who was waiting to get into a nearby restaurant and saw a man walk by who was injured in the attack.
â€œWe heard someone shout and then a woman screamed â€˜run inside!â€™ We ran inside and hid under the table,â€ said Klibbe, who teaches English in Paris.
The four people wounded were out of danger, Interior Minister Gerard Collomb told reporters.
A picture seen by Reuters showed a bare-chested and bearded young man dressed in black sweatpants lying on the ground and being helped by emergency services. A source said he was the attacker.
â€œWe heard gun fire, two gun shots,â€ said waitress Sarah Gousse. â€œThe street was just filled with police and firemen and they tried to revive him (the attacker).â€
Another source said the person killed, who authorities have not officially identified, was a man aged 29.
In October, in an incident similar to Saturdayâ€™s, a man stabbed two young women to death in the port city of Marseille before he was shot dead by soldiers.
The deadliest of the attacks that have hit France over the past three years occurred in Paris in November 2015, when 130 people were killed. (Reuters)