'Lone-wolf' or homegrown violent extremism is characterized by:

Explanation

FBI / DHS threat assessments highlight that lone offenders — often radicalized through online content with minimal physical contact with formal organizations — are exceptionally difficult to detect through conspiracy-based intelligence because there is no conspiracy to penetrate. Early warning typically comes from observable pre-attack behaviors (leakage to family, online posts, surveillance, weapon acquisition) that security officers and the public may notice. This drives the importance of suspicious-activity reporting and the 'See Something, Say Something' campaign. (b), (c), and (d) describe other threat categories.