"The enemy within is the most daunting, because you don't have people crossing borders, which would make them easier to detect, since they're already integrated and often in very tight communities" says Will Geddes, managing director of ICP Group, an international security consultancy. "The more extreme groups tend to isolate themselves. I hate to draw this analogy, but it's a bit like with pedophile rings. They remain in their own isolated community, in a similar way to terrorists, in the way that you could have two cells that are literally a street apart but won't necessarily know of each other's existence."
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