Matsumoto sarin attack Location Matsumoto, Nagano, Japan Date June 27, 1994 10:40 pm (JST) Attack type Mass murder, chemical warfare, terrorism, attempted assassination Weapons Sarin Deaths 8[1] Injured 500+[2] Perpetrators Aum Shinrikyo Motive Attempt to assassinate judges presiding over criminal charges against Aum Shinrikyo