On May 15, a cylindrical explosive was thrown near Prime Minister Kishida, who was visiting a fishing port to support a by-election for the House of Representatives. Police arrested Ryuji Kimura (2), an unemployed man from Kawanishi City, Hyogo Prefecture, on suspicion of obstruction of business by force.
When the police analyzed the computer seized from the suspect's home, they found that they had repeatedly browsed the LDP website. Police believe that the suspect who prepared the explosives was checking the dates of his election speeches on the Internet and looking for an opportunity to attack.