Purpose: As concerns are growing about terrorists approach to biological weapons highlighted by the current COVID-19 crisis, it is important to better understand the historical development and past use of biological weap-ons. Since the World War, attempts to attack CBRN by state-sponsored terrorism and non-state terrorist groups have been constantly occurring. It is important to assess past cases in order to be able to cope well with potential CBRN threats and evaluate the current capabilities of extremists. Method: Identify the theoretical background of bioactive and chemical agents, examine the use cases of bio-chemical weapons that have been used during World War, and assess the threat levels of CBRN terrorism recently. In particular, identify examples being attempted in Europe and look at the international response strategies of Europe and the United Nations. Specifically, we look at the CBRN terrorism international response system of Eu-ropol and UNCCT. Results: The rise of ISIS In Europe and white nationalists in the U.S. have been constantly trying to threaten CBRN since then. The reason why terrorist groups, including ISIS, are attracted to CBRN is that it is not easy to produce agents and weapons, but it is possible to achieve the purpose of terrorism through mass murder. Nev-ertheless, jihadists and white nationalists in the U.S. do not abandon their plan to take over vulnerable security facilities dealing with CBRN-related materials to achieve their goals Conclusion: Biochemical weapons were used during the two World Wars, which inspired the post-Cold War New Territories. In addition, despite international regulatory cooperation such as the Vienna Treaty, several countries still produce CBRN secretly. Terrorist groups are diversifying their means of terrorism, including con-ventional weapons, vehicle thrusts, and biochemical weapons, targeting unspecified individuals. Security measures seem necessary to prevent terrorist groups and lone wolves from exploiting bio-terrorism in the current era of Corona.
2. Theoretical Background
3. Historical Case of CBRN Attack
4. CBRN Attack: Focusing on Europe
5. International Response to CBRN Terrorism
6. Conclusion: Terrorism in the Age of Coronavirus