Japan's Mt. Asama, straddling central Gunma and Nagano prefectures, erupted early Monday from its summit crater, sending ash showers as far as Tokyo and its vicinity in the southern Kanto region, the Japan Meteorological Agency said.
The eruption of the volcano also sent about 2 millimeters of ash in the town of Karuizawa in Nagano Prefecture, but local government said it has not received any reports of damage, Xinhua reported.