Thanks to Twitter two useful academic references to US-UK research, one is online and the other only an abstract. The theme is Mental Illness and Lone-Actor Terrorism, although far more is covered.
Article:http://onlinelibrary.wiley.com/doi/1...029.12312/full
Abstract:http://www.ncbi.nlm.nih.gov/pubmed/25133916
What is of note is that a third of:Lone-actor terrorists regularly engaged in a detectable and observable range of activities with a wider pressure group, social movement, or terrorist organization.
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