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When al-Qaeda's No. 2 leader, Ayman al-Zawahiri, called off a planned chemical attack on New York's subway system in 2003, he offered a chilling explanation: The plot to unleash poison gas on New Yorkers was being dropped for "something better," Zawahiri said in a message intercepted by U.S. eavesdroppers.
The meaning of Zawahiri's cryptic threat remains unclear more than six years later, but a new report warns that al-Qaeda has not abandoned its goal of attacking the United States with a chemical, biological or even nuclear weapon.