Police were preparing to drain an old underground tank in a wooded area in Indianapolis near where a 6-week-old boy went missing two days before.
City police Sgt. Kendale Adams said officers had found the spot during their search for Delano Wilson on Friday. He said police intend to use a snake camera to search the tank once it's partially drained.
Adams and Police Chief Rick Hite say investigators are examining all aspects of the baby's disappearance, including the father's account.
An Amber Alert for the child was issued Wednesday night, about eight hours after 23-year-old Willie Wilson told police his son had been taken by a man and woman who knocked him out in an alley.
The alert says a white man and a Hispanic woman were last seen with the infant in an early 2000s blue, four-door Ford Taurus car in a neighborhood just west of the city's downtown.
Adams says the FBI is assisting with the investigation.
Anyone with information on Delano or his abductors is asked to contact the Indianapolis Metropolitan Police Department at 1-888-58AMBER.