Guiyang, Ramadan 6, 1435, Jul 3, 2014, SPA -- Four people have been killed and another four injured in the collapse of a high-speed railway tunnel under construction in southwest China's Guizhou Province. Rescue efforts ended on Wednesday for the workers trapped by the Dadu Mountain tunnel cave-in, which occurred at 11 a.m. on Tuesday, Xinhua quoted the provincial work safety administration as saying. The four injured workers have been taken to a local hospital and their lives are not in danger. The cause of the accident is being investigated. --SPA 21:28 LOCAL TIME 18:28 GMT www.spa.gov.sa/w