The police investgate the site of a traffic accident on an expressway in northwest China's Gansu Province, March 3, 2014. At least 10 people have been confirmed dead after a bus overturned on an expressway in Gansu early Monday morning. (Xinhua/Hou Jun)

A woman injured in a traffic accident receives treatment at a hospital in Gannan Tibetan Autonomous Prefecture, northwest China's Gansu Province, March 3, 2014. At least 10 people have been confirmed dead after a bus overturned on an expressway in Gansu early Monday morning. (Xinhua/Hou Jun)

The police investgate the site of a traffic accident on an expressway in northwest China's Gansu Province, March 3, 2014. At least 10 people have been confirmed dead after a bus overturned on an expressway in Gansu early Monday morning. (Xinhua/Hou Jun)

 The police investgate the site of a traffic accident on an expressway in northwest China's Gansu Province, March 3, 2014. At least 10 people have been confirmed dead after a bus overturned on an expressway in Gansu early Monday morning. (Xinhua/Hou Jun)