Forty-four people were killed and 11 injured Saturday, when a tour bus collided with two vehicles and plunged off a Tibetan highway and over a cliff.
China's official Xinhua news agency said Sunday that the three-car pile-up occurred Saturday afternoon in mountainous southern Tibet.
Xinhua said the bus was carrying 50 people, mostly tourists from four Chinese provinces. The other vehicles were a sport utility vehicle carrying four people and a pickup truck with only a driver. Their condition is unclear.
The news agency said police have detained managers of the Feixing Travel Agency and the Shengdi Vehicle Tour Company pending an investigation.
