Nanjing Massacre survivors and relatives of massacre victims attend a memorial ceremony at the Memorial Hall of the Compatriots Murdered in the Nanjing Massacre in Nanjing, capital of east China's Jiangsu Province, April, 4, 2012. People on Wednesday paid homage to the victims of the Nanjing Massacre committed by Japanese invading troops in 1937 on the occassion of the Qingming Fesitval, Tomb-sweeping Day. [Xinhua]