AlHijjah 2, 1432, Oct 29, 2011, SPA - Twenty-one people were killed and seven injured when a vehicle carrying railway construction workers overturned in northwest China's Gansu Province on Saturday, the official Xinhua news agency said. Xinhua said the vehicle overturned in Manwa township in Lintao County. Local authorities are investigating the cause of the accident, Xinhua was quoted as reporting by Reuters.