Aum Shinrikyo Tokyo subway sarin attack

Aum Shinrikyo Tokyo subway sarin attack
Title	Aum Shinrikyo Tokyo subway sarin attack
Date	20 March 1995
Location	Tokyo, Japan
Perpetrators	Aum Shinrikyo
Weapons	Sarin nerve agent
Fatalities	13
Injuries	>6,000

Aum Shinrikyo Tokyo subway sarin attack was a coordinated chemical terror operation using sarin on the Tokyo subway system on 20 March 1995 that killed 13 people and injured over 6,000. The attack was carried out by members of Aum Shinrikyo and precipitated major legal, policing, intelligence, and public health changes in Japan, prompting international responses from United Nations agencies and reactions in cities such as Seoul, Washington, D.C., and London. The incident is a landmark in modern terrorism history and in the study of chemical weapons proliferation.

Background

Aum Shinrikyo was founded by Shoko Asahara in 1984 as a religious movement with roots in Shinto, Buddhism, and esoteric teachings inspired by figures like Maharishi Mahesh Yogi and organizations such as Soka Gakkai. The group expanded into corporate and scientific ventures through entities like Kobayashi-owned laboratories, acquiring assets and personnel including former members of Japan Self-Defense Forces and researchers from institutions like Tokyo University and Hokkaido University. Tensions with Japanese authorities escalated after incidents involving chemical experiments, armed samurai-style training, and lawsuits with municipalities such as Saitama Prefecture and corporations including Mitsubishi subsidiaries. International scrutiny involved agencies like the Central Intelligence Agency and the Ministry of Foreign Affairs (Japan), while domestic concerns prompted investigations by the National Police Agency and local Metropolitan Police Department units.

Planning and preparation

Planning involved Aum Shinrikyo leadership, including Shoko Asahara and lieutenants such as Tomomitsu Niimi, Yoshihiro Inoue, and Kiyohide Hayakawa, coordinating members from facilities like the group’s compound in Kamikuishiki Village and labs in Chiba Prefecture. The operation leveraged the group’s chemical program, which developed nerve agents at sites linked to contractors and scientists with ties to institutions such as Tokyo Institute of Technology and private firms in Saitama Prefecture. Logistics used vehicles registered in Tokyo, safe houses in suburbs like Kawaguchi and Hachioji, and networks resembling transnational plots discussed in analyses by FBI and Interpol. Procurement and procurement avoidance echoed cases involving Iraq's chemical efforts and were later compared to inspections by Organisation for the Prohibition of Chemical Weapons investigators.

The attacks (March 20, 1995)

On 20 March 1995, Aum Shinrikyo operatives executed coordinated releases of sarin on five trains on three lines of the Tokyo subway: the Marunouchi Line, the Hibiya Line, and the Chiyoda Line. Perpetrators carried plastic bags and umbrellas containing sarin in paper containers and punctured them on trains near stations such as Kasumigaseki Station, Hibiya Station, Akasaka-mitsuke Station, and Kita-senju Station. The attacks coincided with a session of the National Diet and affected commuters heading to ministries like the Ministry of Finance and the Ministry of Health, Labour and Welfare, as well as workers bound for corporate headquarters like Mitsui and Sumitomo. Emergency calls overwhelmed dispatch centers in Tokyo Metropolitan Government and media outlets including NHK reported chaotic scenes, while international press from outlets such as The New York Times and BBC News covered global reactions.

Immediate response and emergency services

Emergency response involved Tokyo Metropolitan Police Department units, Tokyo Fire Department hazardous materials teams, ambulance crews from municipal hospitals like St. Luke's International Hospital, and support from the Self-Defense Forces in decontamination and transport. First responders coordinated with specialists from institutions such as Tokyo Medical University and the National Institute of Infectious Diseases; hospitals like Keio University Hospital and Juntendo University Hospital treated victims. Public alerts were issued by the Prime Minister of Japan's office, while agencies including the Ministry of Health, Labour and Welfare and the World Health Organization provided guidance on nerve agent exposure and triage.

Investigation, arrests, and trials

Investigations by the Metropolitan Police Department and the Public Prosecutors Office traced evidence to Aum Shinrikyo facilities, leading to raids at compound sites in Kamikuishiki Village and arrests of key figures like Shoko Asahara, Tomomitsu Niimi, Yoshihiro Inoue, Seiichi Endo, and Kiyohide Hayakawa. The criminal process involved prosecutors from the Tokyo District Public Prosecutors Office and trials at the Tokyo District Court and later the Supreme Court of Japan, resulting in death sentences and life imprisonments. The legal proceedings engaged human rights organizations such as Amnesty International and legal scholars from Keio University and Waseda University debated issues similar to those in cases before the International Criminal Court. International cooperation included forensic assistance from agencies like FBI and chemical analysis consultants linked to the Chemical Weapons Convention framework.

Aftermath and legal/policy changes

After the attack, Japan enacted and amended laws affecting religious corporations and public safety, influencing legislation debated in the National Diet and administrative actions by the Public Security Examination Commission and the Ministry of Justice. Police and intelligence reforms expanded capabilities of the National Public Safety Commission and interagency coordination with prefectural police, while public health systems updated protocols at institutions such as the National Institute of Public Health and municipal emergency centers. Internationally, the incident affected Convention on the Prohibition of Chemical Weapons discourse, prompted reviews by the United Nations Security Council, and influenced counterterrorism policies in nations including United States, United Kingdom, and France.

Victims, health effects, and memorials

Victims included commuters, civil servants, and employees from corporations like Mitsubishi and Sony, with fatalities among individuals aged across demographics; notable injured were treated at St. Luke's International Hospital and Keio University Hospital. Health effects ranged from acute cholinergic crisis to long-term neurological and psychiatric sequelae documented by researchers at University of Tokyo and Osaka University, while compensation claims involved civil litigation in district courts and settlements overseen by the Ministry of Health, Labour and Welfare. Memorials and commemorations occur at sites near Kasumigaseki Station and monuments maintained by municipal governments and survivor groups, with public remembrance events attended by officials including former Prime Minister Junichiro Koizumi and representatives from international bodies such as the United Nations.

Category:1995 in Japan Category:Chemical weapons attacks Category:Terrorist incidents in Tokyo