Police call off search for four-year-old missing in Australian outback
Gus was last seen playing outside his house on the family's remote sheep station
Police - who do not suspect foul play - say they will continue investigating, but that the case has become a "recovery operation".
His grandmother left him alone for about half an hour before checking on him, only to find the boy missing, prompting one of the largest land and air searches in Sout
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