XINING, June 29 (Xinhua) -- Five people were killed and six more were injured Saturday evening in a road accident in northwest China's Qinghai Province, local police said.

The accident occurred in Huangyuan County at around 6:40 p.m, when a tractor crashed into a jeep and two cars. The tractor's brakes seemed to have failed on a long slope.

Five people in one car were killed. Another six people were injured and hospitalized with no life-threatening condition.

The cause of the accident is under investigation.