Born on November 21 1985, in the poor Paris suburb of Courcouronnes, Mostefai's criminal record shows eight convictions for petty crimes between 2004 and 2010, but no jail time.

Paris prosecutor Francois Molins said Mostefai had been singled out as a high-priority target for radicalisation in 2010 but, before Friday, he had "never been implicated in an investigation or a terrorist association".

The brother, one of four boys in the family along with two sisters, turned himself in to police after learning Mostefai was involved in the attacks.

While he had cut ties with Mostefai several years ago, and knew he had been involved in petty crimes, his brother said he had never imagined his brother could be radicalised.

The last he knew, Mostefai had gone to Algeria with his family and his "little girl," he said, adding: "It's been a time since I have had any news."

"I called my mother, she didn't seem to know anything," he said yesterday.

A source close to the enquiry said Mostefai regularly attended the mosque in Luce, close to Chartres, to the southwest of Paris.

More: http://zeenews.india.com/news/world/paris-attacks-know-how-omar-ismail-mostefai-became-terrorist_1822152.html

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One of the attackers has been named in French media as Omar Ismaïl Mostefai, a 29-year-old Frenchman from the southern Paris suburb of Courcouronnes. He had been flagged as being close to radical Islam, but had never been linked to terrorism. He was reportedly identified from police fingerprint records as one of the attackers at the Bataclan music venue.