The death toll of the rock burst accident at a coal mine in Hezi City in east China's Shandong Province has risen to 21, after two more miners have been confirmed dead. Among the miners trapped after the rock burst, only one survived, authorities said. The accident occurred at Longyun Coal Mining Co. Ltd. in Yuncheng County on October 20. A total of 22 people were trapped in a tunnel after a rock burst led to an avalanche of coal inside the tunnel.