Road in C China city's downtown caves in A road in downtown Changsha, Hunan province, caves in on May 15, 2012. As reconstruction work...

Road in C China city's downtown caves in

A road in downtown Changsha, Hunan province, caves in on May 15, 2012. As reconstruction work began, the cause of the cave-in was not known. [Photo/CFP]

A road in downtown Changsha, Hunan province, caves in, on May 15, 2012. [Photo/CFP]

A road in downtown Changsha, Hunan province, caves in on May 15, 2012. [Photo/CFP]

A road in downtown Changsha, Hunan province, caves in on May 15, 2012. As reconstruction work began, the cause of the cave-in was not known.