Four people were killed and eight injured after a bus overturned on an icy road in northwestern Gansu Province, local government authorities said on Tuesday.

The conditions of the injured were not immediately known.

The accident occurred at about 4 p.m. on Monday in Qingshui County, Tianshui City, when a bus with 28 people aboard slid off the road and overturned as it was trying to avoid an oncoming bus.

A team of traffic police, officials and medical workers rushed to the scene to carry out rescue operations.

An investigation into the accident is under way.

(Xinhua News Agency January 30, 2008)