France Tracking Possible Terror Cell Members

France’s top security official says the country is tracking hundreds of people believed to belong to possible sleeper cells for terror organizations. Interior Minister Bernard Cazeneuve laid out the increasingly urgent question for intelligence services: How to identify when someone transforms from a disgruntled criminal into a terrorist and how to block that radicalization.

The man behind the Copenhagen shootings last weekend was known to the Danish security service and may have been radicalized during a jail stint, just like at least two of the Paris gunmen.

ABC’s Tom Rivers joined us from London to discuss.

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