Bullet trains from Guangzhou city to Beijing are suspended.  Winds were strong enough near Shanwei to blow cars off the road as Typhoon Usagi, the world’s most powerful storm this year, hit China

Typhoon Usagi has killed at least 25 people after crashing ashore in southern China, throwing the region’s transport systems into chaos and leaving tens of thousands of airline passengers stranded in Hong Kong.

Schools and businesses were shut as activity in the normally teeming financial hub slowed to a crawl after Usagi punched a long swathe of Chinese coast with torrential rain and winds of up to 165km (103 miles) per hour during the night.

The deaths were reported by Chinese state media after Usagi, which meteorologists say was the world’s most powerful storm this year, made landfall in Guangdong province northeast of Hong Kong yesterday evening, prompting the highest level of alert from the National Meteorological Centre.

The reports by Xinhua news agency and CCTV did not say how the 25 people were killed but said all the deaths were in Guangdong after the typhoon brought down trees and damaged roads.

Bullet trains from Guangzhou city to Beijing were suspended and Xinhua said that winds were strong enough near Shanwei to blow cars off the road. More than 47,000 fishing boats were in harbour and schools were closed in 14 coastal cities.

Usagi had previously killed two people in the Philippines and unleashed landslides and power outages across southern Taiwan at the weekend as it ploughed through the Luzon Strait with ferocious winds and heavy downpours.

Monsoon rains exacerbated by Usagi brought flooding on today to the Philippines capital Manila and nearby provinces.

As the typhoon bore down on Hong Kong, operators shut down one of the world’s busiest sea ports and nearly 450 flights were either cancelled or delayed as Cathay Pacific and other airlines imposed pre-emptive suspensions.

The Observatory said it was the strongest typhoon to brush Hong Kong since 1979. Tens of thousands of people had their travel plans upended with ferries and trains also disrupted, while Cathay said it expected flights to start resuming only from noon (0400 GMT) on today.

Many passengers were milling around Hong Kong airport hoping to rebook their flights, but hand-written signs in Chinese and English warned them that there was little chance of getting standby seats on flights out today and to check back later.

Officials in Hong Kong, which is well versed in typhoon preparations, said that 13 people were injured during the storm, while more than 60 trees had fallen.

Major thoroughfares were empty and signboards swayed in the wind early today, but some residents ignored official warnings and headed out to the coastline in raincoats to brave the wind.

Last week, Usagi killed three people in Vietnam.