1. https://www.coe.int/en/web/counter-terrorism.
2. https://en.wikipedia.org/wiki/November_2015_Paris_attacks.
3. https://www.hrw.org/report/2016/11/03/grounds-concern/belgiums-counterterror-responses-paris-and-brussels-attacks.
4. https://www.ceps.eu/ceps-publications/eu-and-2016-brussels-terrorist-attacks-better-instead-more-information-sharing/.
5. https://www.leparisien.fr/faits-divers/charlie-hebdo-surveiller-les-suspects-24h-24-aurait-necessite-40-policiers-minimum-09-01-2015-4432035.php.