The Associated Press
FREDERICK, Md. -- FBI agents combed laboratory suites at Fort Detrick -- home to the Army's biological warfare defense program -- on Tuesday, and a source said they were again looking for evidence in the 2001 anthrax attacks.
The labs at the U.S. Army Medical Research Institute of Infectious Diseases have been closed since Friday, a Fort Detrick spokesman said.
A law-enforcement source, speaking on condition of anonymity, said the activity is related to the anthrax mailings that killed five people.