A volcano erupted near Tokyo early Monday, spewing a plume of smoke more than 1.6 kilometers high and raining ash down on parts of the city.
There were no immediate reports of injuries or damage.
Mount Asama, about 145 kilometers northwest of Tokyo, erupted at 1:51 a.m. Monday, according to Japan's Meteorological Agency.
The agency said volcanic ash fell on nearby areas as well as parts of Tokyo. TV reports showed neighborhoods sprinkled with white flakes.