14 MAY 2018: Investigators are following the trail of a 20-year-old Frenchman born in Chechnya who rampaged through a festive Paris neighbourhood slashing passers-by with a knife, raising anew the spectre of terrorism in France after less than two months of calm.

Using a knife, the man identified as Khamzat Azimov killed one person and wounded four others in a festive area near Paris’ old opera house. Police shot him to death as he charged them, witnesses said. Less than 24 hours later, investigators were questioning three people, his parents and a friend.

The Islamic State group quickly claimed responsibility for the Saturday night attack via its Aamaq news agency, saying Azimov was their ‘soldier’ acting in response to the group’s calls for supporters to target members of the US-led anti-IS military coalition, a stock response. France’s military has been active in the coalition since 2014.

On Sunday, Aamaq released a posthumous video said to show the attacker calling on Muslims in Europe to “take action in the land of disbelievers” if they can’t travel to the crumbling caliphate in Iraq and Syria, which has been pounded by coalition forces. The man said French citizens should pressure their government “if you want it (attacks) to end.”

SITE Intelligence Group, which monitors jihadi propaganda, obtained the video, which could not be independently authenticated. The young man’s face is covered, except for his eyes, with a black bandanna and the hood of his coat. The video was made outside amid trees and falling rain. French authorities had no comment.

Police detained Azimov’s parents in the northern 18th district of Paris and held a friend from Strasbourg in that city on the border with Germany in eastern France, French officials said. The friend was detained Sunday afternoon.

Security official said investigators searched the Paris residence of the parents. The official wasn’t authorized to speak about the investigation and insisted on not being quoted by name.

French media reported that the family had lived in Strasbourg, and it wasn’t clear if the suspect moved to Paris with his parents.

The suspect was on a police watch list for radicalism, a judicial official not authorized to speak publicly about the case told The Associated Press. But he had a clean criminal record and did not know his victims, Interior Ministry spokesman Frederic de Lanouvelle said.

Witnesses reported hearing the man shouting “Allahu akbar,” the Arabic phrase for “God is great,” during the attack that happened at about 9 pm in a lively area near the Opera Garnier.

The assailant obtained French nationality in 2010, the Interior Ministry spokesperson said. He was born in November 1997 in the largely Muslim Russian republic of Chechnya, where extremism has long simmered. Chechens have been among the numerous foreign fighters in Syria and Iraq, some joining the Islamic State cause early in the fighting.

Chechnya’s president weighed in after the rampage, perhaps striking a nerve by insisting Sunday that France bears responsibility for the knifings. He said Azimov held a Russian passport only until he was 14 years old.

“I consider it necessary to state that all responsibility for the fact that Khamzat Azimov went on the road of crime lies completely with the authorities of France,” Chechen President Ramzan Kadyrov said. “He was only born in Chechnya, and his growing up, the formation of his personality, his views and persuasions occurred in French society.”

France has counted the most foreign fighters in Syria and Iraq of all European nations, many but not all of North African origin.

The attacker targeted five people and then fled, according to Paris police and a witness. When police officers arrived minutes later, he threatened them and was shot dead. Several witnesses said the attacker ran directly toward police.

Bar patrons and opera-goers described surprise, confusion and panic as the drama unfolded, with people crawling under restaurant tables, and ordered to stay inside while the police operation was underway in the 2nd arrondissement, or district, on Paris’ Right Bank.