Although in recent years increased the number of attacks carried out by the so-called lone wolves, contemporary terrorist threats are still based on organizational structures that have not only national but also international scope, the number of members of which ranges from several to even several thousand terrorists. It should be emphasized that terrorist organizations are involved in operations all over the world. Although the vast majority of them operate in the Middle East and North Africa, terrorist incidents also occur regularly in other regions, including Europe. The modus operandi of individual groups is rather similar. Still, it is worth paying attention to their ideology, the way they achieve their goals, as well as the support t...