The accident took place Wednesday after the vehicle left the northeastern Chinese city of Ji'an and was about halfway to its destination of Dandong, which borders North Korea, the official Xinhua News agency said.
China's Foreign Ministry said 28 people were aboard the bus — 26 South Koreans plus one driver and one tour guide from China. Ten South Koreans and the driver were killed, ministry spokeswoman Hua Chunying said, expressing condolences to the victims.
