This is the dramatic moment a tornado triggered by Typhoon Bualoi tore roofs from homes in northern Vietnam.

Footage shows a twister swirling through a residential area, sending debris flying into the air in Nam Dinh on Monday morning, September 29.

Authorities confirmed that Bualoi had triggered at least eight tornadoes across several provinces, including Ninh Binh, Hai Phong, Hai Duong, Thanh Hoa, Thai Binh, Quang Ninh, and Hanoi.

In Ninh Binh, the vortex left nine people dead and 18 others injured. Eleven single-storey houses collapsed, 126 homes were damaged, and 53 utility poles were brought down.

Bualoi hit Vietnam early Monday morning with winds reaching 130 km per hour, leaving at least 19 people dead and 88 others injured.

The typhoon had previously caused at least 20 deaths in the Philippines and forced hundreds of thousands of families into evacuation centres.

The storm has now weakened into a tropical depression as it moves towards northern Laos.