Matsumoto incident

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The Matsumoto incident (松本サリン事件, Matsumoto Sarin Jiken^?) was an occurrence of sarin poisoning that happened in Matsumoto, Japan, in Nagano prefecture, on the evening of June 27 and the morning of June 28, 1994.

Seven people were killed and over 200 were harmed by sarin gas that was released from several sites in the Kaichi Heights neighborhood. The first calls to emergency officials occurred around 11:00 p.m.; by 4:15 a.m. the following morning, six people had died from the poison. On July 3, officials announced that the toxic agent had been identified as sarin by gas chromatography. After the incident, police focused their investigation on one of the victims, Yoshiyuki Kouno. Kouno was dubbed by the media "the Poison Gas Man" and received hate mail, death threats, and intense legal pressure. After the attack on the Tokyo subway in 1995, the blame was shifted to the cult Aum Shinrikyo and the police and media publicly apologised to Kouno.

The Matsumoto incident preceded the better-known attack on the Tokyo subway in 1995. Several Aum Shinrikyo members were found guilty of masterminding both incidents. These two instances are the only known uses of chemical agents by a terrorist group. Combined, the attacks resulted in 19 deaths and thousands hospitalizations or outpatient treatment.