Visitors watch a memorial photo show to mark 73rd anniversary of the start of Japan's...

Visitors watch a memorial photo show to mark 73rd anniversary of the start of Japan's invasion of China at the "September 18" Incident Museum in Shenyang, capital of northeast China's Liaoning Province, Sept. 18, 2004. The Japanese Guandong Army stationed in Northeast China suddenly bombarded Shenyang under the excuse of explosions occurred along the South Manchuria Railway on September 18, 1931. In January 1932, all the three provinces in Northeast China were occupied by the Japanese army. To remind the Chinese people of the national humiliation, Sept. 18 was decided as the Day to mark the incident.