According to the VnExpress newspaper, the floods and landslides were caused by Typhoon Son Tinh.
Since Wednesday, Son Tinh turned into a tropical depression and caused the destruction of major roads in the country.
The disaster also led to inundation of over 80,000 hectares of rice.
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About 4,000 houses have been damaged and tens of thousands of hectares of crops destroyed, the disaster office said, warning of more heavy rains to come.
The National Hydro-Meteorological Forecasting Center has warned that rivers in the central provinces of Thanh Hoa and Nghe An could flood in the coming days.