Lone actors or small cells of individuals typically radicalized to violence online and who primarily use easily accessible weapons have posed the greatest terrorism threat to our homeland.
With lone actors, there are no informers, no infiltration, no ongoing surveillance...you don't know what their capability is until they strike.
Everyone leaves breadcrumbs, and there are still signs that someone is planning an attack, as long as you know what you're looking for.
Those behaviors, Spaaij says, include things like surveilling a potential target area, gathering weapons, researching how to carry out an attack.
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