French security officials questioned family and friends of Khamzat Azimov on Monday as the terror group ISIS claimed responsibility for the attack.
Mr Azimov, a naturalised French citizen, was shot dead by police on Saturday night after stabbing a 29-year-old man to death in the busy Opera district of central Paris and wounding four others.
The dead man was the 246th victim in extremist attacks since 2015 in France. Although seven per cent of all French people who have gone to fight in Syria are Chechens, it is the first atrocity perpetrated by someone from the community in the wave of crime.
The detained friend was said by locals to be the "individual closest" to Mr Azimov, whose parents have also been taken into custody.
The young man was arrested by heavily armed, masked police on Sunday at his home in Strasbourg.
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Read more:
ISIS releases video of hooded 'Paris attacker'
Knife-wielding Paris assailant was 'of Chechen origin'
ISIS claims knife attack in Paris
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He was escorted out in handcuffs with his face covered, wearing a t-shirt that said "Defend Grozny" - the capital of Russia's North Caucasus region of Chechnya - with a picture of a machine gun.
The ISIS propaganda agency Amaq posted the video online using Telegram, featuring a young man wearing a hood with only his eyes exposed and the lower part of his face covered by a black cloth.
Speaking in French, he vows allegiance to ISIS leader Abu Bakr Al Baghdadi.
The attack in the Right Bank on Saturday night by a knifeman, later shot dead by police, left one person dead and four wounded.
"The author of this knife attack in Paris is a soldier of the Islamic State and the operation had been carried out in retaliation against the states in the coalition," said a "security source" at Amaq, referring to the international forces, including France, that are fighting militants in Syria and Iraq.
The attacker was a French citizen who was born in Chechnya and had been on two watchlists for suspected extremism.
His name was on the "S file" surveillance system and a more targeted "File for the Prevention of Terrorist Radicalisation" (FSPRT), which focuses on people judged to be terror threats.
In addition to Mr Azimov, who had been flagged as a suspected extremist, several others behind deadly attacks including the brothers who carried out the Charlie Hebdo gun massacre in 2015.
French media reported the victim was a 29-year-old man identified only by his first name, Ronan, who was living in the 13th district of Paris. One of his neighbours told reporters he was a "very smiling" man, with a "great generosity".
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The specs
Engine: Long-range single or dual motor with 200kW or 400kW battery
Transmission: Single-speed automatic
Max touring range: 620km / 590km
Price: From Dh250,000 (estimated)
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Blackpink World Tour [Born Pink] In Cinemas
Starring: Rose, Jisoo, Jennie, Lisa
Directors: Min Geun, Oh Yoon-Dong
Rating: 3/5
Company Profile
Name: Thndr
Started: 2019
Co-founders: Ahmad Hammouda and Seif Amr
Sector: FinTech
Headquarters: Egypt
UAE base: Hub71, Abu Dhabi
Current number of staff: More than 150
Funds raised: $22 million
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In Full Flight: A Story of Africa and Atonement
John Heminway, Knopff
Our family matters legal consultant
Name: Hassan Mohsen Elhais
Position: legal consultant with Al Rowaad Advocates and Legal Consultants.
What to watch out for:
Algae, waste coffee grounds and orange peels will be used in the pavilion's walls and gangways
The hulls of three ships will be used for the roof
The hulls will painted to make the largest Italian tricolour in the country’s history
Several pillars more than 20 metres high will support the structure
Roughly 15 tonnes of steel will be used
The specs
Engine: 2.7-litre 4-cylinder Turbomax
Power: 310hp
Torque: 583Nm
Transmission: 8-speed automatic
Price: From Dh192,500
On sale: Now
THE SPECS
Engine: 6.0-litre, twin-turbocharged W12
Transmission: eight-speed automatic
Power: 626bhp
Torque: 900Nm
Price: Dh1,050,000
On sale: now