A traffic accident that killed 36 people and injured three on Sunday was the fault of the drivers, the traffic management bureau of the Ministry of Public Security said on Wednesday.

Yang Jun, director of the bureau, said preliminary investigations have shown that the drivers of the sleeper bus and the methanol tank it rammed into broke traffic laws and regulations and the accident has exposed a number of weak points in traffic safety.

"The management for traffic safety did not work properly and the hidden dangers, which have existed for a long time, have not been effectively resolved, which we must pay greater attention to," the director said.