Paris knifeman's murky path from 'reserved' student to extremist
Khamzat Azimov, who kept his beard short over a youthful face, was not considered a major threat despite being on France's two watchlists for suspected extremists since 2016.
"It was his relatives who alerted the security services, as opposed to his behaviour, actions or ideas" which might have drawn scrutiny, a source close to the inquiry told AFP.
Yet on Saturday night the 20-year-old described by neighbours as a quiet student spread terror throughout a bustling area of restaurants and theatres just a short stroll from the historic Paris opera house.
Investigators have taken Azimov's parents into custody for questioning as well as a friend in Strasbourg, the eastern town where he grew up that is home to a large community of refugees from Chechnya.
They were among hundreds who fled the Muslim-dominated Russian republic during two bloody separatist wars against Moscow-backed forces.
The conflict gave birth to a fierce Islamic insurgency that would eventually produce fighters who would join other militant groups, including the Islamic State, which claimed responsibility for Saturday's attack in Paris.
But a manager of the apartments in the northern 18th arrondissement of the French capital where the Azimovs rented a room said there was nothing overtly religious about the family.
Calling them "very discreet," the woman said "there was nothing ostentatious in terms of religion" and described Khamzat Azimov as a young man who favoured tracksuits and "said he was a student".
- 'Discreet family' -
A neighbour also spoke of "a very discreet family, never any problems," adding that they "never received visitors".
And the son "wasn't a thug, but someone who was reserved," she added.
"They have been living here for a little over a year," said Reda, another resident in the building.
"The father worked sometimes, mostly in construction, painting. The mother worked for an association which helps the homeless," she said.
Witnesses to Saturday's attack said Azimov remained composed as he began attacking people with a 10-centimetre (four inches) blade shortly before 9:00 pm (1900 GMT).
"He approached calmly, a total contrast with the panic all around him," said Romain, 34, who was placing an order with his wife and six-year-old son at the Starbucks cafe on the Avenue de l'Opera.
"He had a beard, not very long, and was dressed normally. He didn't fit the stereotype" of a jihadist, he said.
Investigators have yet to reveal how Azimov became radicalised. One source told AFP he had been questioned by anti-terror investigators last year "because he knew a man who was in contact with a person who had gone to Syria."
He did not have a criminal record, and became a French citizen as a teenager in 2010 following his mother's naturalisation.
But his attack echoed a similar one last October, when a knifeman who also carried no ID papers began stabbing people at the main train station in the southern city of Marseille, killing two people.
That attack was also claimed by the Islamic State.
© 2018 AFP