Were these terrorists "home grown" in Paris?

[Igel]

10. Not probative.

Locals would have their roots in the Maghreb, west north Africa. Perhaps parents, perhaps recent immigrants. But the 2nd language there is French to this day because of continuing ties to France. They'd appear to be locals.

The same was true in much of Syria and Lebanon, which were also French back in the day. Syrians speak much less French, but it's still not uncommon in Lebanon.

It's a question of accent and fluency at that point. But if you're yelling, a lot of foreign or regional accent tends to vanish.