Study questions FBI's conclusions on anthrax attacks

The anthrax in the letters sent to government and media offices in Washington and New York cannot be definitively tied to the anthrax in the possession of a Fort Detrick researcher, according to a new report released Tuesday by the National Research Council.

An NRC committee reviewed the scientific procedures the FBI used during its investigation of the anthrax attacks that killed five people and sickened 17 over a period of weeks after the Sept. 11, 2001, terrorist attacks.