A smartphone used by the father of an 11-year-old boy who was found dead has a web history of searching for ways to abandon a body, investigative sources said Sunday.

The police department of Kyoto Prefecture is investigating 37-year-old? Y¨±ki Adachi, and the the routes he?took in his car, believing that he attempted to delay the discovery of his son's body.

Police arrested Adachi on Thursday on suspicion of abandoning the body of his son, Yuki, in a forested area of the city of Nantan in the Kyoto prefecture.?