In the case where a clinic entering a building in Kita-ku, Osaka was set on fire and 25 people were involved, police analyzed the smartphone of the suspect found at the scene and searched for keywords such as "the worst violent incident in history" It turned out that the history of the arson was left.


Police are investigating the case, assuming that they were proceeding with the plan by investigating the cases in which many people were killed in the past.

On the 17th of last month, 25 people involved were killed, one was seriously injured, and police suspected murder and arson in an incident in which a clinic for psychotherapy internal medicine entering a building in Sonezakishinchi, Kita-ku, Osaka was set on fire. Morio Tanimoto (61 at the time) who is investigating has died.



When the police found and analyzed Tanimoto's smartphone from the burn marks on the scene, he found that there was a history of searching with keywords such as "What is the worst violent incident in Japanese history?"



He also found that he had downloaded a file that appeared to be a dissertation from a research institute such as a university on past indiscriminate murders and arson murders.



Police are investigating the case, assuming that Tanimoto was proceeding with the plan by investigating the cases in which many people were killed in the past.

The suspect's smartphone search history

According to police, what the suspect had downloaded to his smartphone was a paper from a research institution such as a university that had keywords such as "mass murder" and "arson murder" in the title, and indiscriminate murder and arson that occurred in the past. It considers the behavior patterns, means and motives of the murderer.



Some of them described the plan of the criminal while introducing specific cases such as the street demon murder case that occurred in Akihabara, Tokyo 14 years ago.



According to the analysis of smartphones,


▽ arson murder case that occurred in Kyoto animation three years ago


▽ fire in the building of Sennichi department store in Osaka in 1972 that killed 118 people


▽ in 2003 in the subway of Daegu, Korea There was a history of searching for

arson cases that killed 192 people


.



In addition, there was a history of searches on pages that answer questions on the website regarding "the worst violent incident in Japanese history."

Expert "Analysis for Crime Deterrence"

Kumiko Ando, ​​an associate professor at St. Marianna University School of Medicine, who specializes in criminal psychiatry, said that the suspect was probably searching for cases such as indiscriminate killings. I didn't know, but from the history of online searches, I get the impression that "If you die, let's get people involved and die" or something like a guess at society or others. I feel that I can't fail because I've been preparing for several months. "



He added, "In today's society, the internet environment has developed, and it is possible that we have compared our unfavorable situations with the criminals of past incidents."



In addition, he points out that in order to deter crime, it is necessary to analyze the social background of similar incidents and take measures.