Beijing, Feb 11 - At least 21 vehicles collided Saturday on a fog-engulfed expressway in China, killing two people and injuring six others, police said.

The accidents took place between Changzhou and Nanjing cities in Jiangsu province, Xinhua reported.

A witness said heavy fog reduced visibility to around 20 metres on the expressway.

"Traffic was at a standstill and vehicles lined up for several hundred metres along the road," he said.(IANS)