An earthquake rocked China tonight, causing at least 10,000 homes to collapse and injuring more than 300 people. The quake, measuring 6.0 on the Richter scale, hit Yunnan province's Yao'an county in the south west of the country. It was was followed by eight aftershocks. So far there have been no reports of deaths. But Chinese official state media said that at least 336 people were injured, with 30 cases serious. More than 40,000 houses were damaged by the tremor – of which a quarter collapsed. State officials said they were sending 4,500 tents, 3,000 quilts and other relief materials...