ASSESSMENTS

Al Qaeda and the Threat of Chemical and Biological Weapons

Dec 4, 2004 | 02:09 GMT

Al Qaeda and the Threat of Chemical and Biological Weapons Read more: Al Qaeda and the Threat of Chemical and Biological Weapons
Workers enter the Russell Senate Office building in Washington on Feb. 4, 2004, after a ricin-contaminated letter was found on Feb. 2

Mannie Garcia/Getty Images

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