A powerful bomb explodes at the Mitsubishi Heavy Industries headquarters in Marunouchi, Tokyo. Eight are killed, 378 are injured. Eight left-wing activists are arrested on May 19, 1975 by Japanese authorities.
Mitsubishi Heavy Industries, Ltd. (三菱重工業株式会社, Mitsubishi Jūkōgyō Kabushiki-kaisha, informally MHI) is a Japanese multinational engineering, electrical equipment and electronics corporation headquartered in Tokyo, Japan. MHI is one of the core companies of the Mitsubishi Group and its automobile division is the predecessor of Mitsubishi Motors.
MHI's products include aerospace and automotive components, air conditioners, elevators, forklift trucks, hydraulic equipment, printing machines, missiles, tanks, power systems, ships, aircraft, railway systems, and space launch vehicles. Through its defense-related activities, it is the world's 23rd-largest defense contractor measured by 2011 defense revenues and the largest based in Japan.