TAIYUAN -- Three people died and many were injured after a passenger bus rolled over on an expressway in northern China's Shanxi province on Thursday.

The bus carrying 51 people, on the Shanxi section of the expressway linking Erenhot and Guangzhou cities, crashed into the guardrail of the expressway at around 8 am, according to the provincial traffic police authorities.

Rescue workers have rushed to the site. The cause of the accident is currently unknown.