This is interesting, if it’s indeed true:

Attentats #Paris > les services secrets algriens auraient prvenu la France le 6 janvier de l’imminence d’une attaque terroriste (@itele)

— itele (@itele) January 9, 2015

The Algerian intelligence services warned France on January 6 of an imminent terrorist attack.

They must’ve picked up some chatter either through SIGINT or HUMINT.