Terrorism in Europe

European governments and the European Union (EU) have grappled with domestic and foreign terrorist groups for decades, but numerous attacks since 2014 have renewed concerns about terrorism and violent extremism in Europe. Despite variances in how terrorist events are defined and tracked, studies indicate that terrorism poses a security threat in many European countries (see data from Europol, the EU's agency for police cooperation, in Figure 1). European countries and the EU are key U.S. partners in the fight against terrorism, and Members of Congress may be interested in European counterterrorism efforts.