Six people were injured, including one critically, in landslides and flash floods triggered by heavy rains that started battering the country on Wednesday, the National Emergency Management Agency said.

Two people were found dead under a pile of earth on Saturday on a mountain in Bonghwa county, 150 miles southeast of Seoul, local emergency officer Hong Kyung-chul said.

Agency workers used a helicopter to provide rice, water and other necessities to Bonghwa, where dozens of villagers were isolated, the agency said in a statement. Main roads to the area were still inaccessible and electricity and telephone lines would not be restored for another week, it said.

Three people died on Friday after their houses were hit by landslides, the agency said. A day earlier, two soldiers were killed in a mudslide near their army base in Yanggu, about 110 miles east of Seoul.

The rainfall damaged or flooded about 620 houses across the country, prompting 1,290 people to seek refuge elsewhere, the statement said. About 1,040 people later returned home, but the rest remained in local schools, community centres and other temporary shelters.

Some 3,010 acres of farmland were inundated, the emergency agency said.

More rain and thunderstorms were expected to hit Seoul, the eastern province of Gangwon, and the southeastern province of Gyeongsang throughout the weekend.

Dongducheon, a city just north of Seoul, has received about 15 inches (37 centimetres) of rain since Wednesday, and major cities in Gangwon were pelted with about 11 inches (28 centimetres), the agency said.