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FBI documents show that the agency investigated People for the Ethical Treatment of Animals in the late 1990s after hearing claims that the group was planning an anthrax attack.
At least 11 workers at U.S. biological laboratories were infected with dangerous pathogens from 2004 to 2010, the federal Centers for Disease Control and Prevention said Tuesday in a report on security measures stemming from the deadly 2001 anthrax attacks.
After a building has been contaminated with deadly anthrax, how do you know the cleanup has made it fully safe? The government still hasn't figured that out, an investigation concludes.