The investigation continues almost three years later.
And the FBI says they have no suspects in the deadly anthrax mailings that had Americans on alert. The focus now is on who could've had the expertise to handle the bacteria.
Media outlets and government offices were the target of the anthrax-laced letters. It killed five people and sickened 17 others.
Viewers with disabilities can get assistance accessing this station's FCC Public Inspection File by contacting the station with the information listed below. Questions or concerns relating to the accessibility of the FCC's online public file system should be directed to the FCC at 888-225-5322, 888-835-5322 (TTY), or email@example.com.