Police received an anonymous tip implicating Aum Shinrikyo after the gas attacks but the sect was not officially implicated in the incident until after the later Tokyo subway sarin attack . One section of the tip read , " Matsumoto was definitely an experiment of sorts . The result of this experiment in an open space : seven dead , over 200 injured . If sarin is released in an enclosed space , say , a crowded subway it is easy to imagine a massive catastrophe . " After the incident , police focused their investigation on Yoshiyuki Kōno , whose wife was a victim put in a coma by the gas . It was discovered that Kōno had stored a large amount of pesticide in his residence . Although sarin can not be manufactured from pesticides , Keiichi Tsuneishi , a Japanese historian , claimed the nerve agent is synthesizable from organophosphorus pesticides , and Kōno was dubbed by some in the media " the Poison Gas Man " and received hate mail , death threats , and intense legal pressure . After the truth became known , every major Japanese newspaper apologized to Kōno , including those that had not named him as a suspect
Tokyo subway sarin attack
Tokyo subway sarin attack
Matsumoto sarin attack