Monks pray for the victims of Nanjing Massacre during China's first National Memorial Day for Nanjing Massacre Victims in Nanjing, east China's Jiangsu Province, Dec. 13, 2014. In February 2014, China's top legislature designated Dec. 13 as the National Memorial Day for Nanjing Massacre Victims to mourn those killed by Japanese invaders and expose war crimes committed by the Japanese. [Photo/Xinhua]