Forensics of the French police are at work in the northern Paris suburb of Saint-Denis, on November 18, 2015, (AFP)

Forensics of the French police are at work in the northern Paris suburb of Saint-Denis, on November 18, 2015 (AFP)

An Armed French policeman (L) and a CRS riot policeman secure the scene at the raid zone in Saint-Denis, near Paris, France, November 18, 2015 (Reuters)

French special police forces secure the area as shots are exchanged in Saint-Denis, near Paris, France, November 18, 2015 (Reuters)

Police deploys as forensics of the French police (background) work outside a building in the northern Paris suburb of Saint-Denis, on November 18, 2015arrested (AFP)

Forensics of the French police are at work in the northern Paris suburb of Saint-Denis, on November 18, 2015 (AFP)

French Interior Minister Bernard Cazeneuve (2ndR) and Paris prosecutor Francois Molins (2ndL) arrive at the scene of a police raid in Saint-Denis, near Paris, November 18, 2015 (Reuters)

Masked French judicial police unit members walk at the scene of the raid in Saint-Denis, near Paris, France, November 18, 2015 to catch fugitives from Friday night's deadly attacks in the French capital. (Reuter)

A member of the French judicial police unit speaks on the phone at the raid scene in Saint-Denis, near Paris, France, November 18, 2015 (Reuters)

French special police forces secure the area as shots are exchanged in Saint-Denis, France, near Paris, November 18, 2015 during an operation to catch fugitives from Friday night's deadly attacks in the French capital. (Reuters)