Pak was arrested without charge on September 2 , 1923 , the day after the Great Kantō earthquake . Two days later Kaneko was also detained by police . Based on thin evidence they were eventually charged with high treason for plotting a bomb attack upon the wedding of Crown Prince Hirohito . Both were convicted and sentenced to death on March 25 , 1926 , but their sentences were commuted to life imprisonment by the Emperor Shōwa . Kaneko died in prison on July 23 , 1926 , reportedly by suicide
Great Kantō earthquake
1923 Great Kantō earthquake
Pak Yol