Al Qaeda leader al Zawahiri still a constant threat

May 2, 2012 4:16 PM

Dr. Ayman al Zawahiri rose through the ranks of al Qaeda to become Osama bin Laden's right hand man. Now, one year after the death of their leader, al Zawahiri is expected to prove himself by orchestrating an attack. Bob Orr reports on the ongoing hunt for the terrorist mastermind.

Zawahiri a "terror mastermind" who hasn't orchestrated any terror

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