More than 60 people are dead and dozens missing after record rainfall caused rivers to burst their banks in Hiroshima and other areas.
The heavy rainfall stemmed from the remnants of a typhoon that hit south-western Japan last week.
A fresh evacuation order was issued Tuesday for residents in the town of Fuchu in Hiroshima Prefecture after the Enoki River running through the town overflowed earlier in the day after driftwood blocked its flow.
President Muhammadu Buhari on Thursday commiserated with the government and people of Japan over the loss of lives and property following a downpour that resulted in flooding and landslides. HuffPost reports that evacuation orders or advisories were issued for 4.72 million people. Authorities warned that landslides could strike even after rain subsides as the calamity shaped up to be potentially the worst in decades.
Some 276,000 households now lack water supply, Kyodo news agency reported.
Emergency service workers pass a damaged road following a landslide, on July 10, 2018 in Yanohigashi near Hiroshima, Japan. Mitsubishi Motors Corp., which resumed operations at its Mizushima plant in Kurashiki on Monday, again halted production as workers' families were affected by the disaster.
At least 80 people have died in torrential rains that pummeled wide areas of western Japan.
He says the United Nations chief "commended the government's efforts to help people affected and expressed his admiration for the domestic search and rescue teams helping those in need".
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"We don't know how long it will take for the recovery", said Okayama official Imawaka.
In the city of Kurashiki, 500,000 people endured the worst of the flooding, with some forced to climb to the roof of a hospital to await rescue over the weekend.
More than 70,000 rescue workers, including the fire service and the army, are now involved in relief efforts. While evacuation notices are no longer in effect, two million people are still being advised to keep away from their homes.
Hiroshima resident Akira Tanimoto on Monday returned to the apartment complex where he and his wife live to check on their unit and their pet birds, which they initially had to leave behind, the Associated Press reported.
Prime Minister Shinzo Abe visited the flood-ravaged region, promising that his government would do whatever it could to bring a return to normalcy. "Thankfully, I was OK and nobody in this neighborhood was severely injured", he told The Japan Times.
The toll has risen steadily since then, and the conditions have made rescue operations hard, with some desperate citizens taking to Twitter to call for help.
Police, Japan's Coast Guard, firefighters and 179 helicopters are involved in the rescue. Critical infrastructure has been hit, including railway tracks. The government also set up a special disaster relief headquarters for the emergency on July 8.