(CNN) A heat wave in southern Japan has killed at least eight people, dealing another blow to a country still recovering from the worst flooding in decades.

Six people died on Saturday, and two people on Sunday, Kyodo News reported , as thousands sought medical treatment for heat stroke and heat exhaustion.

Of 33 people who sought medical help in Hiroshima Sunday, three were volunteers who were helping with the clean up, according to the city's disaster management office.

The heat wave struck the same prefectures where flooding and landslides killed at least 210 people last week, compounding the already difficult recovery ahead.

Nineteen people remain missing or unaccounted for from the floods, and 64,000 personnel are still conducting search and rescue operations, officials said Monday.

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