On 9 January, police tracked the assailants to an industrial estate in Dammartin-en-Goële, where they took a hostage. Another gunman also shot a police officer on 8 January and took hostages the next day, at a kosher supermarket near the Porte de Vincennes. GIGN (a special operations unit of the French Armed Forces), combined with RAID and BRI (special operations units of the French Police), conducted simultaneous raids in Dammartin and at Porte de Vincennes. Three terrorists were killed, along with four hostages who died in the Vincennes supermarket before the intervention; some other hostages were injured.