France has listed more than 10,000 people suspected of being radicalized or potential security threats, including homegrown assailant Omar Ismail Mostefai who killed scores of people at Paris's Bataclan music on Friday.
According to police sources, the so-called "fiche S" is updated daily to include individuals suspected of links to a terrorist movement or group.
The "S" stands for the suspects' potential to endanger the "security of the state."
The list has 15 categories spanning everyone from football hooligans to battle-hardened jihadists returning from Iraq and Syria.
The suspects come into the spotlight if they are arrested or subject to a check after which they are immediately on the radar of the intelligence services.
