An official website of the United States government. Here's how you know

##### Official websites use **.gov**

A **.gov** website belongs to an official government organization in the United States.

##### Secure **.gov** websites use HTTPS

A lock () or *https://* means you've safely connected to the **.gov** website. Share sensitive information only on official, secure websites.

Submit SearchSearch

FBI

            -  Most Wanted
            -  News
            -  What We Investigate
            -  How We Can Help You
            -  Submit a Tip
            -  About
            -  Contact Us
            -  Home 
            -  History 
            -  Famous Cases and Criminals 
            -  Facebook Icon 
            -  Email Icon 
            -  Twitter Icon 
            -  Youtube Icon 
            -  Flickr Icon 
            -  LinkedIn Icon 
            -  Instagram Icon 
            -  Search FBISubmit Search 

FBIFederal Bureau of Investigation

# Amerithrax or Anthrax Investigation

History

                -  A Brief History 
                -  Directors, Then and Now 
                -  Famous Cases and Criminals 
                -  Field Office Histories 
                -  Wall of Honor 
                -  Artifacts 
                -  Reports & Publications 
                -  Seal & Motto 
                -  Stories & Multimedia 
                -  Timeline 

# Amerithrax or Anthrax Investigation

Laboratory technician holding the anthrax-laced letter addressed to Senator Leahy after safely opening it at the U.S. Army's Fort Detrick bio-medical research laboratory in November 2001.

Soon after the terrorist attacks of 9/11, letters laced with anthrax began appearing in the U.S. mail. Five Americans were killed and 17 were sickened in what became the worst biological attacks in U.S. history.

----

**For more information on the Amerithrax investigation:**
                    - FBI Response to Independent Expert Behavioral Analysis Panel Report on Anthrax Mailings – March 23, 2011
                    - FBI and Justice Department Response to NAS Review of Scientific Approaches Used During the Investigation of the 2001 Anthrax Letters – February 15, 2011
                    - DOJ Announcement Formally Closing the Case – February 19, 2010
                    - FOIA Documents – February 19, 2010
                    - Science Briefing on the Investigation — August 18, 2008
                    - Release of Affidavits — August 6, 2008
                    - Closing a Chapter on Anthrax — August 6, 2008
                    - Amerithrax Fact Sheet — September 2006
                    - Letter to Congressman Rush-Holt (pdf) — September 28, 2006
                    - Letter Addressed to Senator Patrick Leahy — November 2001:                       - Forensic Analysis: An Interview with Joseph DiZinno of the FBI Laboratory
                      - The Search for AnthraxPress Release of November 19, 2001
                      - Press Release of November 17, 2001
                    - Linguistic/Behavioral Analysis of the Anthrax Letters — November 9, 2001
                    - Statement of Director Mueller — October 16, 2001

----

**Photo Galleries:**
                    - The Envelopes
                    - Search for Anthrax
                    - The Leahy Letter
                    - The Analysis

              -  Most Wanted 
              -  Ten Most Wanted 
              -  Fugitives 
              -  Terrorism 
              -  Kidnappings / Missing Persons 
              -  Seeking Information 
              -  Bank Robbers 
              -  ECAP 
              -  ViCAP 
              FBI Jobs
Submit a Tip
Crime Statistics
History
FOIPA
Scams & Safety
FBI Kids

              -  News 
              -  Stories 
              -  Videos 
              -  Press Releases 
              -  Speeches 
              -  Testimony 
              -  Podcasts and Radio 
              -  Photos 
              -  Español 
              -  Apps 
              -  How We Can Help You 
              -  Law Enforcement 
              -  Victims 
              -  Parents and Caregivers 
              -  Students 
              -  Businesses 
              -  Safety Resources 
              -  Need an FBI Service or More Information? 

              -  What We Investigate 
              -  Terrorism 
              -  Counterintelligence 
              -  Cyber Crime 
              -  Public Corruption 
              -  Civil Rights 
              -  Organized Crime 
              -  White-Collar Crime 
              -  Violent Crime 
              -  WMD 
              -  About 
              -  Mission & Priorities 
              -  Leadership & Structure 
              -  Partnerships 
              -  Community Outreach 
              -  FAQs 

              -  Contact Us 
              -  Field Offices 
              -  FBI Headquarters 
              -  Visit the FBI Experience 
              -  Overseas Offices 
              -  Additional Resources 
              -  Accessibility 
              -  eRulemaking 
              -  Freedom of Information / Privacy Act 
              -  Legal Notices 
              -  Legal Policies & Disclaimers 
              -  Privacy Policy 
              -  USA.gov 
              -  White House 
              -  No FEAR Act 
              -  Equal Opportunity 

# fbi

### federal bureau of investigation

                -   
                -   
                -   
                -   
                -   
                -   

### FBI.gov Contact Center

##### Email updates

          -              -  Accessibility 
            -  eRulemaking 
            -  Freedom of Information / Privacy Act 
            -  Legal Notices 
            -  Legal Policies & Disclaimers 
          -              -  Privacy Policy 
            -  USA.gov 
            -  White House 
            -  No FEAR Act 
            -  Equal Opportunity 

FBI.gov is an official site of the U.S. Department of Justice © 

    - Home
    -  Most Wanted 
    -  News 
    -  What We Investigate 
    -  How We Investigate 
    -  How We Can Help You 
    -  Submit a Tip 
    -  About 
    -  Contact Us 
    - Crime Statistics
    -  Photos 
    -  Video 
    -  Outreach 
    -  History 
    -  FOIA 
    -  Scams & Safety 
    -  FBI Kids 
    - FBI Jobs