GUANGZHOU - At least three buildings collapsed on Monday afternoon after subsidence in Guangzhou, capital of south China's Guangdong Province.

At around 4:40 pm, subsidence occurred at a road junction in the Liwan district of downtown Guangzhou. About three neighboring shop buildings collapsed successively, said rescuers.

There are no casualties from the incident, which was near a metro tunnel construction site, said Guangzhou Metro Corporation on its official Sina-Weibo account, China's version of Twitter.

At 4:20 pm, metro builders found land subsiding near the project site and helped evacuate the area. Afterwards, the ground sank and buildings collapsed, Guangzhou Metro said.

As of 8 pm, rescuers adopted risk-prevention methods by backfilling concrete into the subsidence area. Monitoring statistics show that there is no further risk and the accident site is stable, it said.

According to a witness, surnamed Xu, some trees fell down at about 4:30 pm. Two two-story neighboring shop buildings then collapsed with ground subsidence nearby.

Around 6:30 pm, a shop building of five or six stories collapsed, Xu added.

The cause of the incident is being investigated.