The Who's Who AT Al-Qaeda

Some have now been captured or killed, and some new names have been added to those still at large. Ayman al-Zawahri is believed to serve as Bin Laden's spiritual adviser, and doctor. He is also the architect of the al-Qaeda ideology.

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The latest videotape in which al-Qaeda leader Osama Bin Laden threatened the United States has renewed speculation as to where he could be hiding.