Sirens were sounded to alert residents as a river swelled during Super Typhoon Ragasa in the Philippines.

The flood warning device automatically went off as the Chico River rose in Bontoc town and threatened to spill over into nearby homes in Mountain Province at 3 pm local time on Monday.

Footage shows muddy waters churning as the river rose to a red alert level.

The Bontoc disaster response office urged residents to evacuate, saying: 'Bring essentials like identification, medications, important documents, water, non-perishable food, clothing, and a first-aid kit. Avoid flooded roads or bridges—use designated evacuation routes.'

Ragasa, locally known as Nando, made landfall in the country's remote and poverty-stricken Babuyan Islands at 3 pm local time on Monday. It arrived as the Philippines continues to grapple with weeks of severe flooding brought on by an unusually intense monsoon season.

The region's low-lying geography, inadequate drainage systems, and rapid urbanisation make it especially vulnerable to flooding.

Limited infrastructure often struggles to handle the heavy rainfall, resulting in widespread flash floods.

State weather bureau PAGASA left the Philippine monitoring zone at 8 am today after temporarily displacing thousands of residents. Authorities said one person was killed and seven were injured in a landslide in Benguet province.

Ragasa was expected to remain in the South China Sea until Wednesday, passing south of Taiwan and Hong Kong before touching down on the Chinese mainland.