Children attend a memorial ceremony at the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders in Nanjing, capital of east China's Jiangsu Province, Dec. 13, 2012, to mark the 75th anniversary of the Nanjing Massacre. Nanjing was occupied on Dec. 13, 1937, by Japanese troops who began a six-week massacre. Records show more than 300,000 Chinese unarmed soldiers and civilians were killed. [Xinhua]