A vehicle carrying railway construction workers overturned in northwest China\'s Gansu Province Saturday, killing 21 people and inuring seven others, local authorities said. The accident happened at about 7:30 a.m. in the Manwa Township in Lintao County, when the vehicle was travelling to a railway construction site, the Gansu Provincial Work Safety Administration announced in a statement. It was not immediately known about how many workers were aboard the vehicle. Local authorities are investigating the cause of the accident, the statement said.