The Meteorological Agency said Mt. Ontake that straddles Nagano and Gifu prefectures erupted at around 11:53 am, sending smoke down the mountain’s south slope for more than 3-km, news agency Reuters reported.
Mt. Ontake is located about 200-km west of Tokyo.
At least seven people received minor injuries while one person was seriously injured owing to the volcanic eruption. Airplanes were also directed to divert their flying routes.