November 2015 Paris attacks
The exact number of attackers is currently unclear; certain media speak of seven, others of eight attackers. Police think there might be 3-5 attackers who  survived, and are on the run. About ten people were taken in police custody in Brussels, as they might have connections to the attacks. The ringleader of the attack, Abdelhamid Abaaoud, was killed in a police raid in France on 18 November.