At least 85 people have died and 58 are unaccounted for as torrential rains continued to batter parts of western Japan, causing landslides and flooding and forcing millions of people from their homes.
Television footage showed bridges and cars washed away by raging rivers and floodwaters, with people perched on the roofs of their homes, surrounded by water and awaiting rescue.
Japan's Meteorological Agency had issued rare "emergency warnings" against landslides, rising rivers, strong winds and lightning strikes caused by what it called "historic" rains in 23 prefectures across the western and central parts of the country. The rains began last week.
Such warnings are issued in anticipation of the sort of extreme conditions that occur just once or twice in 50 years, Kyodo News reported.
"There are still many people missing and others in need of help. We are working against time," Prime Minister Shinzo Abe said.