Seven people were killed and eight others injured in a mine demolition operation in southwest China's Sichuan province, Xinhua quoted the provincial work safety administration as saying today. A workers' shed was hit by shock waves and rubbles caused by a blasting operation at a nearby granite mine in Miyi county, the administration said. Seven people in the shed were killed and eight others were injured. The injured are being treated in hospital and now in stable condition. The managers of the mine and others responsible for the casualties have been detained, it said. The cause of the accident is still under investigation.