A memorial ceremony for the Nanjing Massacre victims is held at the Exhibition Hall of Evidence of Crimes Committed by Unit 731 of the Japanese Imperial Army in Harbin, capital of northeast China's Heilongjiang Province, Dec. 13, 2025. The 12th national memorial day was observed on Saturday across the country to honor about 300,000 victims killed by Japanese troops during the Nanjing Massacre, in a year that marks the 80th anniversary of the end of World War II (WWII). (Photo by Liu Yang/Xinhua)