People attend a "lights out" mourning ceremony held at the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders, in Nanjing, east China's Jiangsu Province, March 11, 2025. A "lights out" mourning ceremony for four survivors of the Nanjing Massacre who passed away this year was held Tuesday in Nanjing. Two survivors of the Nanjing Massacre passed away on Feb. 15 this year, bringing the number of living registered survivors to 28, according to the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders. (Xinhua/Li Bo)