Two of the nine were not - they were actual, recent immigrants through asylum-seeking process.
"Ahmad al-Mohammad" who came as a refugee through Turkey to Leroa in Greece, and together with him were registered the fingerprints of another immigrant known as "M. al-Mahmodin".
The rest were second-generation immigrants:
Bilal Hadfi was French but he spent time in Syria and came back, not through controlled border crossings, so he might have come with the asylees/immigrants. Others included French citizens Samy Amimour, who fought in Yemen, and Omar Ismail Mostefai and Foued Mohamed-Aggad who fought in Syria, and they were on wanted lists but were not spotted on border, so they appear to have come through people smugglers as well.
https://en.wikipedia.org/wiki/November_2015_Paris_attacks#Id...
If it turns out that they were in fact refugees, that still doesn't make it a migration problem when most of the attackers were French or Belgian.
If he'd jumped on Easyjet from Istanbul, he'd have had to provide a passport and visa and risk being arrested at border check in case the authorities were too interested in his involvement with extremists.
I don't get your point about blue channel; flights from Istanbul are not EU/Schengen internal.
Again, that's not something that totally prevents acts of terror, but would work as a bit of deterrent. I believe I should have a voice about this, because I live in the same Schengen area.
2nd generation immigrants
I'm not against immigration per se, but there's a lot of problems coming from people who fail (because it's mostly their responsibility) to integrate
Truth is, you can be so enclosed in a foreign culture that you will actually stay a foreigner trough all your life.
P.S.: I'm not saying that was the case here, I'm just answering your broader remark.
Also, Belgium political system is also not helping given its fractured nature thus limiting its options to effectively tackle those challenges and if we take into account the weak economic reality of Brussels add to that its ineffective fight of organized crime (Funding terrorist attacks and armaments) creating a perfect storm for this type of events to flourish whether in Belgium or spilling into other parts of Europe like what happened in Paris last November.
That has nothing to do with 'recent migration policies'.
