Members of a Japanese delegation mourn for the victims at the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders in Nanjing, capital of east China's Jiangsu province, March 31, 2017. The delegation has visited Nanjing to mourn for the victims by planting trees during the Tomb-sweeping Day holiday, or Qingming for 32 consecutive years since 1986. [Photo/Xinhua]