The rear-end crashes occurred at about 11:15 a.m. on a section of an expressway in Shandan County, Zhangye City, according to the provincial emergency management authorities.

All the injured have been rushed to the Shandan county people's hospital and the Zhangye municipal people's hospital for medical treatment.

The on-site rescue operation has ended and an investigation into the cause of the accident is underway.

(With UNI Inputs)