Richard Clarke told ABC News he is wary of the report about the New York City subway plot.
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Intelligence sources, however, told CBS News that, as far as they know, there are no terrorist cells operating in the U.S. under the command of Zawahri or bin Laden.
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According to author Ron Suskind, in his book The One Percent Doctrine: Deep Inside America's Pursuit of Its Enemies Since 9/11, the plan for this attack was called off about forty-five days before execution by Al-Qaeda commander Ayman al-Zawahiri.