Students visit the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders, in Nanjing, capital of east China's Jiansu Province, April 3, 2013. Lots of citizens came here to mourn Nanjing Massacre victims on the occassion of Qingming Festival, or Tomb-Sweeping Day, which falls on April 4 this year. (Xinhua/Han Hua)