A man is carried by firefighters after being rescued by a helicopter, in Joso, Ibaraki prefecture, northeast of Tokyo, Friday, Sept. 11, 2015.

The number of people who died in floods which devastated Japan this week reached five Sunday as rescuers continued their search for more than a dozen still missing.

Police said they found the body of a 68-year-old man in Tochigi, north of Tokyo, in the early morning, the fifth located in the rescue operation.

The body was reportedly found inside a submerged car at a water-covered rice field in the town that also suffered floods.

Police also discovered another body of a man in the afternoon in a rice field of most severely-hit Joso, a community of 65,000 residents, parts of which were washed away Thursday when a levee on the Kinugawa river gave way, flooding an area that reportedly spans 32 square kilometres (12 square miles) after the worst rains in decades.

“We’re still investigating the identity of the body and whether the death is related to the flooding,” police told AFP.

Four days have passed since the flooding but search operations continued Sunday with a total of 1,800 rescuers including police, firemen, and the Self-Defense Forces scrabbling to find 15 people still missing from the town, public broadcaster NHK said.

The clock is ticking as the area expects heavy rain in the evening, which could further spread the water damage.

Officials said more than 2,100 people were still at evacuation facilities in Joso Sunday morning as over 4,000 houses were submerged and water supply was cut off.

The number of missing in Joso dropped from 22 to 15 Saturday after police found more victims alive, including a pair of eight-year-old children.

In Kanuma city, north of Joso, a 63-year-old woman was killed in a landslide, while a 48-year-old woman was also found dead in Miyagi prefecture, northern Japan.

The third victim was a 25-year-old man helping to clear clogged drains in the city of Nikko, which is known for its historic shrines.

Police also found the body of a man in another river in Miyagi who was believed to be a 62-year-old missing from the prefecture, according to local media.