HARRISONVILLE, Mo. (AP) — A massive search for a 5-year-old boy with autism has ended with the discovery of his body in a pond near his western Missouri home.

Tony Eugene "Gene" Cory-Ferguson wandered from the rural Cass County home shortly before noon Tuesday — apparently, authorities said, after a repairman left a door open.

KSHB-TV reports divers found his body around 6:30 p.m. Tuesday in an algae-covered farm pond about 100 feet from the home.

The house is located near an agricultural research center with several ponds and planted fields. Emergency personnel used dogs and aircraft in the search, some of it amid dense rows of tall corn.

But the dogs never detected a scent, and authorities told The Kansas City Star that Gene was probably in the pond before the search began.