6) Amerithrax Terrorist Attack
It occurred just after the massive attack of 9/11. This was a less known terrorist attack. it happened exactly after a week. The attack was aimed on the US Congress offices and the offices of the state government of New York. According to the FBI, this case is one of the most difficult cases in the history of America. Didn’t use any weapons and guns, 5 innocent officers were killed. Along with that 17 other people got infected.