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9/11 Investigation

9/11 Investigation (PENTTBOM)

For more information, see "Ten Years After: The FBI Since 9/11"

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They were the most lethal terrorist attacks in history, taking the lives of 3,000 Americans and international citizens and ultimately leading to far-reaching changes in anti-terror approaches and operations in the U.S. and around the globe.

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Our ensuing investigation of the attacks of 9/11—code-named “PENTTBOM”—was our largest investigation ever. At the peak of the case, more than half our agents worked to identify the hijackers and their sponsors and, with other agencies, to head off any possible future attacks. We followed more than half-a-million investigative leads, including several hundred thousand tips from the public. The attack and crash sites also represented the largest crime scenes in FBI history.

For more information:

  • Zacarias Moussaoui: In April 2005, Moussaoui pled guilty to six charges against him related to his participation in the 9/11 conspiracy. In May 2006, he was sentenced to life in prison.
  • FBI Agent Lenny Hatton—who died in the 9/11 attacks—is presented the heroes medal of valor. Former FBI Special Agent in Charge John P. O’Neill also lost his life in the attacks.

07.09.10

Famous Cases by Category
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Terrorism
- 9/11 Investigation
- Anthrax/Amerithrax
- Beltway Snipers: Part 1| Part 2
- East African Embassy bombings 1998
- Eric Rudolph: Part 1 | Part 2
- Millennium Plot/Ahmed Ressam
- Oklahoma City bombing
- Palmer Raids
- Pan Am 103 bombing
- Unabomber
- USS Cole Bombing
- Wall Street bombing 1920
- Weather Underground bombings
- World Trade Center bombing 1993
- Fawaz Younis

Counterintelligence/Espionage
- Aldrich Ames
- Alger Hiss
- Atom Spy Case/Rosenbergs
- Black Tom 1916 bombing
- Duquesne Spy Ring
- Espionage in the Defense Industry
- Hollow Nickel/Rudolph Abel
- Iva Toguri d’Aquino and “Tokyo Rose”
- Maksim Martynov
- Nazi Saboteurs and George Dasch
- ND-98: Case of the Long Island Double Agent
- Pearl Harbor Spy
- Robert Hanssen
- Thwarted Sabotage in Zambia
- Vasilli Zubilin
- Velvalee Dickinson, the “Doll Woman”
- Vonsiatsky Espionage
- Year of the Spy (1985)

Cyber Crime
- Operation Innocent Images

Public Corruption
- ABSCAM
- Operation Greylord
- Operation Illwind
- Tennessee Waltz
- William Jefferson

Civil Rights
- Baptist Street Church bombing
- Emmett Till
- Medgar Evers
- Mississippi Burning
- KKK series

Organized Crime/Gangsters
- Al Capone
- Barker/Karpis Gang
- Bonnie and Clyde
- Joe Pistone, Undercover Agent
- John Dillinger
- John Gotti
- Kansas City Massacre/“Pretty Boy” Floyd
- Lester Gillis (“Baby Face” Nelson)
- “Machine Gun” Kelly
- Roger “The Terrible” Touhy
- The Brady Gang
- The Fur Dressers case

White-Collar Crime
- Enron
- Hurricane Katrina Fraud
- Operation Senior Sentinel
- Operation Stolen Dreams

Violent Crime/Major Thefts/Bank Robberies
- Brinks Robbery
- Charles Ross Kidnapping
- D.B. Cooper Hijacking
- Durkin - Murder of an FBI Agent
- Greenlease Kidnapping
- Jack Gilbert Graham
- James Edward Testerman
- John Elgin Johnson
- Jonestown
- Joseph Edward Earlywine
- Judge Vance murder
- Krupp Diamond Theft
- Lindbergh Kidnapping
- Murder and Mayhem in the Osage Hills
- Nussbaum and Wilcoxson
- Patty Hearst
- Richard Floyd McCoy, Jr.
- The Black Dahlia
- Weinberger Kidnapping
- Weyerhaeuser Kidnapping

Ten Most Wanted
- Billie Austin Bryant
- Gerhard Arthur Puff
- Willie Sutton