BEIJING • Nineteen people died and more than 170 were injured in the eastern Chinese province of Zhejiang over the weekend after a truck carrying liquefied gas exploded on a highway.

Videos of the accident, near the city of Wenling, showed a large explosion that appeared to send the chassis of the truck careening into nearby buildings.

State news agency Xinhua reported yesterday that there was a second blast when the truck fell onto a workshop near the expressway after the first explosion which took place the day before.

Other footage picked up by Chinese state news outlets showed charred facades of nearby buildings with their windows blown out by the shock wave, and flaming wreckage sending up thick black plumes into the sky.

Chinese state news outlets said rescue workers were searching for people trapped in the residential and factory buildings, some of which had collapsed.

The truck was carrying gas between two cities on China's east coast, Ningbo and Wenzhou, and was exiting the highway when the accident occurred, according to the state-run Zhejiang News.

The accident shut down traffic on the highway in both directions. Other videos showed cars nearby on fire. A local official said the cause of the crash and explosion was being investigated.

More than 100 rescue personnel and 34 firetrucks had been called to the scene. Video picked up by state news outlets showed that the truck appeared to have caught fire before the explosion.

China has been trying to raise safety standards in the gas and chemical industries after deadly explosions at a number of plants in recent years.

Over the past two decades China has built an extensive highway network, and the number of vehicles on it has grown rapidly.

That has driven problems with road safety that the government has sought to address in sporadic safety campaigns.

More than 200,000 Chinese die each year in road accidents, according to the World Health Organisation.

NYTIMES, AGENCE FRANCE-PRESSE