Typhoon Doksuri has lashed northern Philippine provinces with ferocious wind and rain, leaving at least six people dead and displacing thousands of others as it blew roofs off houses, flooded low-lying villages and triggered dozens of landslides.

One landslide buried a house in Buguias town in Benguet province, killing a mother, her child and two other children and injuring two other people. In the nearby resort city of Baguio, a 17-year-old died when soil loosened by heavy rains buried his house.

In Isabela province, also in the north, a woman selling bread on a bicycle cart died when she was hit by a falling coconut tree.

The typhoon slammed into Fuga Island before dawn and later smashed into another island in Cagayan province, where nearly 16,000 people were evacuated from high-risk coastal villages, and schools and workplaces were shut as a precaution as the storm approached.

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Rescuers evacuate pigs to safety in Laoag city, Ilocos Norte province, northern Philippines (Bernie Sipin Dela Cruz/AP)

Doksuri weakened slightly but remained dangerous with sustained winds of 109mph and gusts of up to 133mph. I

“Our northern coastal towns are being battered,” Cagayan governor Manuel Mamba said. “I’m receiving reports of tin roofs being blown away and flooding that could not drain out probably because of tidal surges coming in from the sea.”

Mr Mamba expressed fear of extensive damage to Cagayan valley’s corn and rice farms, which had already been battered by a months-long dry spell before Doksuri hit. At least four towns lost power and six bridges were flooded, Cagayan officials said in a damage report.

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Residents try to prevent their boats being swept away by a swollen river (Bernie Sipin Dela Cruz/AP)

“Violent, life-threatening conditions are expected to continue” on Wednesday over north-western Cagayan and the outlying Babuyan Islands as well as the northern mountainous regions of Apayao and Ilocos Norte provinces, the country’s weather bureau said.

Coastguard personnel used rubber boats and ropes to evacuate villagers who were trapped by brown, waist-level floodwaters in their houses in Bacarra town in Ilocos Norte.

Thousands of inter-island ferry passengers and cargo truck drivers, along with nearly 100 passenger and cargo vessels, were stranded in ports where a no-sail order was imposed. Most were able to proceed with their trips as the weather improved, the coastguard said.

The typhoon swelled seasonal monsoon rains in central and northern provinces, including in the densely populated Manila capital region. It was forecast to move away from the northern Philippines on Thursday and barrel north westward to graze Taiwan’s south-western coast before hitting south-eastern China on Friday.

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A police officer looks at landslide damage caused by Typhoon Doksuri in a residential area of Baguio City, northern Philippines (AP)

US officials advised Americans in China not to travel to southern regions and asked those in vulnerable areas to stay in secure shelters and check their emergency kits.

Although it was not poised for a direct hit, Doksuri’s outer bands brought heavy rain and strong winds to Taiwan’s eastern coast on Wednesday. Trains were cancelled between Kaohsiung and Taitung cities in the south, while ferries to outlying islands were also halted.

Taiwan’s Central Weather Bureau reported gusts of up to 123mph.

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Rescuers use a rubber boat to evacuate residents to higher ground in Bacarra, Ilocos Norte province, northern Philippines (Philippine Coast Guard/AP)

Meanwhile, Taiwan continued to hold its annual Han Kuang military exercises.

The military carried out its first-ever drill at the civilian Taoyuan International Airport on Wednesday morning, according to local media. The drill stopped air traffic for an hour while the military simulated stopping an invasion targeting the airport.