A bus carrying 36 passengers overturned on an expressway at 12:38 p.m. local time Saturday in southwest China's Sichuan Province, killing six people and injuring 30 others, according to the company that runs the Ya'an-Xichang Expressway.

Two people were confirmed dead on the spot. Four others died in hospital during treatment, , according to the company that runs the Ya'an-Xichang Expressway..

The injured were rushed to a local hospital, and an investigation is underway.