Research supporting this report was conducted by Meili Criezis, Will DiGravio, Barrett G., Cosima von Moltke, Simona N., Steven Rai, Kevin Reyes, Caroline Wade, Jacob Wagner, Laurie W.

ISD identified 74 violent attacks and disrupted plots in the US in 2025 linked to known extremist movements, online radicalization, or grievance-based violence. These 39 attacks and 35 plots represent a 27 percent increase year-on-year compared to 2024. Attacks in 2025 were also significantly more deadly, with 50 people killed and 162 injured, a 316 percent increase in deaths and a 350 percent increase in injuries.

ISD’s analysis, based on an internal database assembled through open-source reporting and ethnographic monitoring, found that the tactics, suspect/perpetrator characteristics and ideological drivers remain consistent with ISD’s previous research on plots and attacks in 2024.

Note: Many of the individuals discussed in this report have been accused of crimes but have not been convicted at the time of writing. Claims about individuals included in this analysis should be considered allegations until they are proven in court.