However, after the much larger attack on the Tokyo subway in 1995, Kouno was cleared of blame, Aum Shinrikyo was deemed responsible.
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In the 1990s, after characterizing the Yoga practices of Asahara Shoko of Aum Shinrikyo as expressing the inner core of early Buddhist asceticism, Yoshimoto was criticized along with Nakazawa Shin'ichi as a defender of Aum following the Sarin gas attack on the Tokyo subway.
Targets included offices of the Japan Teachers Union, buildings in Osaka and Tokyo of the terrorist sect Aum Shinrikyo (which had perpetrated the sarin gas attack on the Tokyo subway in 1995), the pro-North Korea Chongryon association, and in the only threat taken seriously by the Japanese police, the Deputy Minister of Foreign Affairs Hitoshi Tanaka, who had attempted rapprochement with North Korea in 2002.