TIL of the Tokyo Subway Sarin Attack, where members of the Aum Shinrikyo doomsday cult, in five coordinated attacks, released the chemical weapon, Sarin, on three lines of the Tokyo Metro.
It happend on 20 March 1995, during rush hour. It killed 13 people, severely injuring 50 (some of whom later died) and causing temporary vision problems for nearly 1,000 others. Its leader, whose name I'm not gonna mention (you can read it if you want), was executed on July 6, 2018 by hanging.