<p>Another 22 people were injured after the bus, carrying 33 passengers, tumbled into a 10-metre-deep ravine, probably due to the presence of ice on the road in Guyuan city in Ningxia Hui province, Xinhua reported.Nine people died at the spot and another two died at a hospital.Investigation into the cause of the accident is under way, officials said.</p>
<p>Another 22 people were injured after the bus, carrying 33 passengers, tumbled into a 10-metre-deep ravine, probably due to the presence of ice on the road in Guyuan city in Ningxia Hui province, Xinhua reported.Nine people died at the spot and another two died at a hospital.Investigation into the cause of the accident is under way, officials said.</p>