Vietnam's death toll from Typhoon Bualoi has risen to 19 with another 21 people still missing, making it the most devastating storm to hit the nation this year as heavy rains caused severe flooding in Hanoi and across northern provinces.

Bualoi made landfall on Monday in northern central Vietnam, bringing huge sea swells, strong winds and downpours. Last week, the typhoon had killed at least 10 people in the Philippines.

The government said 88 people had also been injured, more than 100,000 houses were damaged, mostly in Nghe An and Ha Tinh provinces, and more than 10,000 hectares of rice and crops had been inundated.

Rainfall in several parts of Vietnam had exceeded 300mm over the past 24 hours, the national weather agency said as it warned of a risk of landslides and flash flooding.

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