Yes, the Japanese even massacred Koreans after the 1923 Kanto earthquake that hit Yokohama and Tokyo. Rumors of Korean prisoners escaping reached receptive minds among the citizenry, and in a few days, thousands of Koreans had been murdered.
Japan had occupied Korea in 1895, made it a protectorate, used Koreans for a cheap labor force (resulting in additional resentment from Japanese). The deposed Korean emperor died in 1919, and after that the Koreans were more politicized, and the Japanese were more paranoid. One Korean lobbed a bomb at Korea’s Japanese governor, and the Japanese concluded no Korean anywhere was to be trusted — all were insurrectionists at heart. After the quake, anyone caught mispronouncing Japanese with a Korean accent was likely to meet a horrible death. Talk of looting, arson, well poisoning, etc. was everywhere. Hundreds of Koreans (sometimes hundreds at a time) were shot, drowned, deliberately burned alive, in the aftermath of the quake.
Sanity was never fully restored. Survivors remember long.
Koreans and Poles have similar histories.