Yes, anthrax was used after the terrorist attacks of September 11, 2001. In the weeks following the attacks, several anthrax-laced letters were sent to news media outlets and government officials. As a result, several individuals were infected with the anthrax bacteria, and several people died from anthrax-related illnesses.
The anthrax letters were sent to various news organizations in New York, Florida, and Washington, D.C. The letters contained a powdery substance that was later identified as anthrax. Initially, the substance was thought to be an anthrax simulant, but further testing revealed that it was indeed the deadly anthrax bacteria.
In the days and weeks following the attacks, the FBI and other law enforcement agencies launched an investigation into the source of the anthrax letters. This investigation ultimately led to the arrest of Bruce Ivins, a scientist at the United States Army Medical Research Institute of Infectious Diseases (USAMRIID). Ivins was prosecuted for the anthrax attacks, but he committed suicide before the case could reach a conclusion.
The anthrax attacks were a frightening reminder of the potential for bioterrorism and the devastating consequences of such attacks. As a result, the US government increased its efforts to protect against bioterrorism, and the US military began to develop vaccines and treatments for anthrax exposure.
In the end, the anthrax attacks of 2001 remain unsolved. While Bruce Ivins was identified as a suspect in the case, his guilt or innocence can never be known. However, the anthrax attacks serve as a stark reminder of the potential for bioterrorism and the need for increased vigilance and protection against such attacks.