A crane collapsed in a wind power equipment company in northwest China\'s Gansu Province, killing at least five people, authorities said Tuesday. In the incident in Jiuquan city, the arm of the crane broke, causing the crane to collapse, the official Xinhua news agency reported, quoting work safety officials. The five workers were crushed, the report said.A sixth worker was injured but his injuries were not believed to be life-threatening, the report said.The cause of the incident was being investigated.