Twenty Chinese women were killed and four injured when a three-wheeled tractor overturned on a mountain road in the north of the country, state media said Monday.

The accident Sunday in northern China's Liaoning province occurred as the women were driving home after picking herbs, the official Xinhua News Agency said. The brief report gave no additional details.

Motorized tricycles with cargo trailers are commonly used to transport goods and people in China.

China's roads are among the world's most dangerous, with thousands of people dying each year in accidents caused by reckless driving, poor road conditions and overloading of vehicles.