By Yusuf Fernandez, Press TV, Madrid
A US Army scientist called Bruce Ivins is considered to be the only person responsible for the anthrax letters that terrified the United States closely after the September 11 attacks in 2001.
At that time, anthrax-filled mail turned up in the offices of two Democratic Senators, Tom Daschle and Patrick Leahy, as well as news media offices in Washington DC and Florida. Five people died and 17 others fell ill due to exposure to the anthrax. The events were then widely viewed as the work of "Islamic terrorists".
The FBI's investigation of these facts dragged on for years. However, according to a federal prosecutor, US authorities are going to close the case soon.