From Wikipedia.
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The Home Ministry declared martial law, and ordered each section police chief to put the maintenance of order and security as a priority. One of the messages was that "There are some Koreans who are taking advantage of this disaster, committing arson as part of robberies within Tōkyō. Some of them possess bombs. Tōkyō is under martial law and each area (of police force) should be extremely vigilant about Korean activities." Some newspapers reported this message. This started the deadliest rumour of all, that Koreans are rioting, committing looting and arson, and most importantly, poisoning wells. The numerous fires and cloudy well water (a little-known effect of a big quake) all seemed to confirm the rumours in the eyes of the fear-stricken survivors living in the rubble. Vigilante groups set up roadblocks in cities, towns and villages across the region. Because people with Korean accents pronounced "G" or "J" in the beginning of words differently, 15窶ー~ 50窶婁 (jū-go-en, go-jū-sen) and 窶堋ェ窶堋ャ窶堋ョ窶堋ー窶堋イ (gagigugego) were used as shibboleths. Anyone who failed to pronounce them properly was deemed Korean. Some were told to leave, but many were beaten or killed. Moreover, anyone mistakenly identified as Korean, such as Chinese, Okinawans, and Japanese speakers of some regional dialects, suffered the same fate....
More than 2,000 Koreans were taken in for protection from the mobs across the region, although recent studies have shown that there were incidents where army and police personnel are known to have condoned or even colluded in the vigilante killings in some areas. The chief of police of Tsurumi (or Kawasaki by some accounts) is reported to have publicly drunk the well-water to disprove the rumour that Koreans have been poisoning wells. In some towns, even police stations into which Koreans had escaped were attacked by mobs, whereas in other neighbourhoods residents took steps to protect them.
The total death toll from these disturbances is uncertain; according to the investigation by the Home Ministry, confirmed victims of vigilante justice were 231 Koreans killed and 43 injured, 3 Chinese killed, 59 Japanese (including Okinawans) killed and 43 injured. Actual estimates range as high as 6,600, although politically independent studies put the figure at just over 2,500. Three hundred and sixty-two Japanese civilians were eventually charged (for murder, attempted murder, manslaughter and assault), though most got off with nominal sentences, and even those who were sent to jail were later released with a general pardon commemorating the marriage of Prince Hirohito. In contrast, the actual number of Koreans who were charged for crimes during this period were 2 for murder, 3 for arson, 6 for robbery and 3 for rape.
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Japanese army generals helped massacred Koreans, Chinese and Okinawaians during a peaceful time in their own capital city. Do you think the Imperialist army wolud not have killed Chinese or Koreans during war abroad?
Stupidity.