The city of Joso, north of the capital, Tokyo, was hit by a wall of water after the Kinugawa River burst its banks.
people clinging to the rooftops before helicopter rescue teams winched them to safety.
Entire homes and cars were carried away on the torrent as the Kinugawa River burst its banks after two days of heavy rainfall. The flood waters reached as far as 8km (5 miles) from the breach.
The BBC's Mariko Oi says seven people are missing in Joso and one in Tochigi prefecture, and the authorities fear that number will rise.
She said officials confirmed 265 people had been rescued, but at least 100 remain in need of help as rescue efforts are hindered by the night time.
Some areas have had power cuts and transport was disrupted, with many air and train services cancelled or delayed. Some roads were also closed.
Prime Minister Shinzo Abe said the authorities were doing their best.
"The government will stand united and do its best to deal with the disaster... by putting its highest priority on people's lives," he told reporters.
Last month, powerful Typhoon Goni hit Japan's southernmost main island of Kyushu, killing at least one person and injuring 70 others.
The city of Joso, north of the capital, Tokyo, was hit by a wall of water after the Kinugawa River burst its banks. people clinging to the rooftops before helicopter rescue teams winched them to safety.Entire homes and cars were carried away on the torrent as the Kinugawa River burst its banks after two days of heavy rainfall. The flood waters reached as far as 8km (5 miles) from the breach.The BBC's Mariko Oi says seven people are missing in Joso and one in Tochigi prefecture, and the authorities fear that number will rise.She said officials confirmed 265 people had been rescued, but at least 100 remain in need of help as rescue efforts are hindered by the night time.Some areas have had power cuts and transport was disrupted, with many air and train services cancelled or delayed. Some roads were also closed.Prime Minister Shinzo Abe said the authorities were doing their best."The government will stand united and do its best to deal with the disaster... by putting its highest priority on people's lives," he told reporters.Last month, powerful Typhoon Goni hit Japan's southernmost main island of Kyushu, killing at least one person and injuring 70 others.
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