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Al Qaeda leader Ayman al-Zawahiri
Al Qaeda leader Ayman al-Zawahiri

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    Who's worse? ISIS or al Qaeda?

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Who's worse? ISIS or al Qaeda?

With ISIS taking many of the headlines these days is al Qaeda still a threat? CNN's Jean Casarez investigates.

Who's worse? ISIS or al Qaeda?

With ISIS taking many of the headlines these days is al Qaeda still a threat? CNN's Jean Casarez investigates.