The Anthrax case is finally closed. After a long awaited 7-year trail, FBI officials closed the case today. The conclusion was that the attacks were done from a single government researcher: Dr. Bruce Ivins.

Officials had about 100 pages of findings that they released and announced their decision based on all of the extensive amount of evidence from the case. The FBI has been chasing different leads for years, and it was one of the most costly investigations in United States history.

A total of 5 people were killed from the letters laced with anthrax and 17 other people were sickened by the attacks. The letters were sent to news organizations and lawmakers shortly after the terrorist attacks of 9/11.

The culprit, Dr. Bruce Ivins, who was a 62-year-old microbiologist, killed himself in 2008 before authorities had a chance to indict him.