Al Qaeda triggers worldwide terror threat

CNN has learned that a message sent from Al Qaeda leader Ayman Al Zawahiri to an affiliate leader was the deciding factor that led to the closure of American embassies, and triggered a global travel alert.  But that was not the only intelligence that has U.S. counter-terror officials concerned.  Anderson gets the latest from Philip Mudd a senior official with the CIA and FBI, National security analyst Peter Bergen, and terrorism analyst Paul Cruikshank.