This United States Department of Justice report is an investigative summary regarding the fall 2001 anthrax letter attacks. The report, released pursuant to the Freedom of Information Act (FOIA), gives an overview of the investigation, including the elimination of Dr. Steven J. Hatfill as a suspect, the investigation of Dr. Bruce E. Ivins, and a summary of evidence from the investigation implicating Dr. Ivins. In the attacks, 35 postal facilities and mailrooms, along with seven buildings on Capitol Hill, were contaminated. During the FBI's seven year investigation, "the Amerithrax Task Force expended over 600,000 investigator work hours, involving in excess of 10,000 witness interviews conducted on six continents, the execution of 80 searches, and the recovery of over 6,000 items of potential evidence. The case involved the issuance of over 5,750 federal grand jury subpoenas and the collection of 5,730 environmental samples from 60 site locations."
United States Department of Justice: http://www.justice.gov/