CHANGSHA - At least three people died in a 21-vehicle pile-up on Wednesday morning on an expressway in central China's Hunan Province.

The rear-end collision happened at around 6 a.m. in foggy weather on the road section between Zhuzhou and Hengyang City of the Beijing-Zhuhai expressway, according to rescuers.

Personnel from the Zhuzhou fire brigade have retrieved three bodies after the accident site.

The exact number of casualties is still unknown and the incident's exact cause is under investigation.