A small eruption was observed on Mount Asama in eastern Japan, prompting the volcanic alert level to be raised to three out of five.
The eruption, which lasted 20 minutes, occurred at 10.08pm near the crater of the 2,568m-high volcano, with smoke reaching about 1,800m above the mountain.
The raised alert means people should not approach the mountain.
Japan's Meteorological Agency warned that large rocks and hot gas could affect a radius of 4 km from the crater and that nearby towns could also be impacted.
Hong Kong court finds tycoon Jimmy Lai guilty in landmark security trial
Ukraine peace talks stretch into second day at start of pivotal week for Europe
Flash floods kill at least 37 people in Morocco's Safi province
'Hero' who disarmed Bondi gunman recovering after surgery, family says
School bus accident in Colombia kills 17, injures 20
