Newly collected items and historical records related to the crimes by Japanese aggressors during the Nanjing Massacre in 1937 are displayed at a press conference in Nanjing, East China’s Jiangsu province, Dec 8, 2014. The Nanjing Massacre Memorial Hall Monday displayed 7,602 items and historical records, including military equipment of Japanese soldiers, news photos and telescopes collected from 14 countries. China has set December 13 as the first national memorial day to commemorate those killed by Japanese aggressors during the Nanjing Massacre. [Photo/China News Service]