In December 2001, as the investigation into the U.S. anthrax attacks was gathering steam, coalition soldiers in Afghanistan uncovered what appeared to be an important clue: a trail of documents chronicling an attempt by al-Qaeda to create its own anthrax weapon.
The documents told of a singular mission by a scientist named Abdur Rauf, an obscure, middle-aged Pakistani with alleged al-Qaeda sympathies and an advanced degree in microbiology.
Using his membership in a prestigious scientific organization to gain access, Rauf traveled through Europe on a quest, officials say, to obtain both anthrax spores and the equipment needed to turn them into highly lethal biological weapons. He reported directly to al-Qaeda's No. 2 commander, Ayman al-Zawahiri, and in one document he appeared to signal a breakthrough.
"I successfully achieved the targets," he wrote cryptically to Zawahiri in a note in 1999.
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