Following the September 11 attacks in 2001, a Federal Bureau of Investigation investigation revealed that 12 of the 19 hijackers trained or resided in Palm Beach County during the months prior to the attacks. Later that month, during the anthrax attacks, a letter containing spores of this substance was mailed to the American Media, Inc. building in Boca Raton. Three people were exposed to the anthrax, including Robert Stevens, a photo editor who later died after an infection induced by exposure.