Former Tepco Chairman Tsunehisa Katsumata and one-time executives Sakae Muto and Ichiro Takekuro were all found not guilty by the Tokyo District Court in 2019, in the only criminal case to arise out of the world's worst nuclear crisis since Chernobyl in 1986.

(Reporting by Sakura Murakami and Mariko Katsumura; Editing by Chang-Ran Kim)