September 1 – The Great Kantō earthquake devastates Tokyo and Yokohama, killing an estimated 142,807 people, but according to a Japanese construction research center report in 2005, 105,000 are confirmed dead. Varied accounts indicate the duration of the earthquake was between four and ten minutes.[3]
September 1-21 - Kantō Massacre: Young Japanese vigilante groups, driven by rumors of a Korean revolt, attack and murder thousands of Korean residents.
September 16 – Amakasu Incident: The feminist Noe Itō and her partner, the anarchist Sakae Ōsugi are beaten and killed by a police squadron led by Lieutenant Amakasu Masahiko, along with Ōsugi's six-year-old nephew, and their bodies disposed in a well. Following countrywide outcry, Amakasu was court-martialed and sentenced to 10 years in prison.[4]
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