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exp kelly lone wolf liveshot_00011001

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    Napolitano: 'lone wolf' top concern

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Napolitano: 'lone wolf' top concern

Homeland Security Secretary Janet Napolitano says the 'lone wolf' threat is a top concern, CNN's Suzanne Kelly reports.

Napolitano: 'lone wolf' top concern

Homeland Security Secretary Janet Napolitano says the 'lone wolf' threat is a top concern, CNN's Suzanne Kelly reports.