Who is this alleged Terrorist - Omar Ismail Mostefai?

He grew up in the Canal neighbourhood, which is ethnically diverse with a young population and a high proportion of social housing. The low-rise council blocks of flats beside the canal are much calmer and less troubled than the more difficult low-income estates of the town of Évry which nudge up against it. The French prime minister, Manuel Valls, used to be mayor of Évry and was vocal about the problems facing the banlieuesuburban estates outside Paris.
As news emerged of Mostefai’s role in the attacks, people in Courcouronnes were milling around near the shopping area and one young man was fishing in the canal. One man who did not want to be named who was at high school with Mostefai said:

He was not a troublemaker. He was someone who stood up for himself – you wouldn’t provoke him because you knew that he’d stand up for himself if you did. But he wasn’t someone who went looking for problems. He was calm, he wasn’t someone who you’d notice, who stood out.
He said Mostefai went to Friday prayers and observed Ramadan, but he didn’t stand out as someone very “serious” about religion. He added: “I’m really surprised to hear he was involved in this, really surprised.”