City officials had refused to compensate him for a Yamaguchi-gumi vehicle that was damaged at a public works construction site in 2003.

[2] It was reported in the Japanese press that prior to the shooting, Shiroo had mailed a letter to TV Asahi outlining his grudges against the mayor and the city government.

[3] In addition to the insurance claim, Shiroo was also reportedly angry that a construction company linked to his gang had been denied a contract by the city government.

[4] Shiroo approached Itoh at 7:50 pm outside his campaign office near Nagasaki Station, shooting him twice in the back with an American-made revolver.

[5] Shiroo was indicted by the Nagasaki District Public Prosecutor's office for murder, gun possession and obstruction of election campaigning.