POLICE have returned to a house in an Australian outback where a four-year-old boy vanished - after calling the search off.

August “Gus” Lamont vanished last Saturday evening while playing outside his grandparents' remote homestead about 24 miles south of Yunta, north-east of Adelaide.

His grandmother last saw him playing near a dirt mound before he vanished.

The only clue searchers uncovered was a single child-sized footprint about 500 metres from the homestead.

Cops called off the search after no clothing, hat, or any other sign of the boy was found.

The case is now officially a missing persons investigation — but police vowed not to stop searching for answers.

“We will continue to pursue ongoing lines of inquiry, and we will not rest until we can try and find the answer t

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