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Reference: Shirakawa Y, Ochi G, Maekawa S, Ogli K, Shintani S. Information disorder in hospitals during the Tokyo Sarin Attack in 1995, Prehospital and Disaster Medicine, vol.12, s24-25, 1995.

The terrorists attacked subway passengers at about 08:00 a.m. and the name of poison, sarin, was announced officially on television at 11:00 a.m. by the Chief of the Metropolitan Police. This television announcement was the first information of the poison name for 145 (73%) of the 210 hospitals/clinics investigated. It was two and a half-hours later after the first patient was transported to an Emergency Medical Center. The delay of the information was attributable to the loss of a chance to administer Pralidoxime Methiodide (PAM), an antidote of sarin, in many patients.

This slide shows that 106 of the 210 hospitals/clinics had the first visit of the victims before the first announcement about the poison name (11:00 a.m.)