Every September 18, sirens sound across China to commemorate the Mukden Incident.
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On the night of 18 Sept 1931, officers of Japan's Kwantung Army staged a small explosion on the South Manchurian Railway near Mukden (Shenyang) and blamed Chinese troops. Japan used it as a pretext to occupy all of Manchuria within months and install the puppet state Manchukuo (满洲国) in 1932. Today Shenyang sounds citywide sirens annually.
