Recent school shooters appear to have crossed paths in online extremist groups

The US state department recently designated the online extremist Terrorgram Collective as a terrorist group. Along with promoting white supremacy, the group encourages violent attacks and "provides guidance and instructional materials on tactics, methods and targets for attacks, including on critical infrastructure and government officials"...

https://www.theguardian.com/us-news/2025/jan/25/school-shooters-online-extremist-groups