Police on Friday began searching the mountains for the body of a boy whose parents are being held on suspicion of receiving child care allowances even though he was last seen about three years ago. He would be 4 now.

Suguru Kajimoto, a reinforcing iron and rebar worker from Sakai, Osaka Prefecture, said he threw the body of his son, Tatsuki, from a road into the mountains straddling Osaka and Nara prefectures, investigative sources said.

The police were searching an area in Gose, Nara Prefecture, that is also close to Chihayaakasaka in Osaka. On Thursday, they took Kajimoto to the area to confirm where he abandoned the body.