Meanwhile, residents are bracing for the full force of Typhoon Hagibis, forecast to make mainland landfall on Saturday night.
Japan’s Meteorological Agency (JMA) issued the highest warning on Saturday, an “Emergency Weather Warning (Level 5)”, as the storm’s approach left one person dead and several injured.
The warning was issued for towns and cities in prefectures including Tokyo Saitama, Kanagawa, Gunma, Yamanashi, Nagano and Shizuoka.
A JMA weather forecaster said: “It is a level 5 situation; some sort of disaster may have already taken place.
“People are strongly advised to act to protect their lives right away.”