Tens of thousands of people in central Japan have been ordered by authorities flee their homes after rain flooded rivers and caused landslides. One person is missing after a mudslide buried houses.
Special downpour warnings have been issued for areas north of Tokyo.
Specialists say the scale of the downpour has not been experienced before and it warned of grave danger.
Authorities have ordered more than 90,000 residents to evacuate, while another 80,000 were advised to leave their homes.
The swollen Kinugawa River in Joso city, home to 65,000 people, has burst its banks.
Some people were left clinging to the roofs of their houses, waiting for helicoptors to rescue them.