A mourning ceremony is held for those killed by the deadly mudslide that occured one year ago in Zhouqu county, Northwest China's Gansu province, Aug 8, 2011. [Photo/Xinhua]

A mourning ceremony is held for those killed by a deadly mudslide that occurred one year ago in Zhouqu county, Northwest China's Gansu province, Aug 8, 2011. [Photo/Xinhua]