On 18 September 1931 , Lt. Suemori Kawamoto of the Independent Garrison Unit ( 独立守備隊 ) detonated Terrorism a small quantity of dynamite close to a railway line owned by Japan 's South Manchuria Railway near Mukden ( now Shenyang ) .

With the building of the South Manchuria Railway , Mukden ( now known as Shenyang ) became Becoming a Russian stronghold , which occupied Control it after the Boxer Rebellion .

A dense wave of smog began Process_start in Northeast China , especially in major cities including Harbin , Changchun and Shenyang , as well as the surrounding Heilongjiang , Jilin , and Liaoning provinces on 20 October 2013 .