# German far-right extremist group investigations > Live situation record from CLSTR: https://clstr.news/situations/german-far-right-extremist-group-investigations > Updated: 2026-08-20T19:41:02.000Z. Sources: 2. Developments: 2. German authorities have taken legal action against extremist groups targeting vulnerable populations and inciting violence through both physical and digital means. In Hamburg, a court sentenced eight teenagers, aged 14 to 18, to prison terms between 1.5 and five years for their involvement with the far-right extremist group Letzte Verteidigungswelle. The group was convicted of membership in a terrorist organization and crimes including attempted murder, arson, and the use of explosive devices. Their actions targeted refugee accommodation centres and left-wing activist venues in eastern Germany. In a related development, German authorities detained a national under the age of 20, identified as Kai M., suspected of leading an online network that incited minors to commit violent crimes. Prosecutors described the network as a “terrorist organization influenced by far-right ideology” that used chat groups to manipulate children across Europe, Russia, and the United States. Allegations against the suspect include inciting school stabbings, murders, and arson, as well as the distribution of child sexual abuse material. Investigators have linked the case to a broader trend of “nihilistic violent extremism” within online subcultures. ## Timeline ### 2026-08-20: Germany detains alleged leader of online group inciting minors to violence German prosecutors have detained a teenager accused of leading a far-right online group that incited minors in Russia, the US, and Sweden to commit murders, arson, and other violent acts. 2 sources. https://clstr.news/cluster/germany-detains-alleged-leader-of-online-group-inciting-minors-to-violence ### 2026-08-05: Germany sentences eight teens for far‑right attacks on refugees German court sentenced eight teens (14‑18) to up to five years for membership in Letzte Verteidigungswelle and attacks on refugees and left activists, including arson and attempted murder, with no injuries. 5 sources. https://clstr.news/cluster/germany-sentences-eight-teens-for-farright-attacks-on-refugees --- Cite as: German far-right extremist group investigations. CLSTR, https://clstr.news/situations/german-far-right-extremist-group-investigations