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SA girl missing since 1992-police appeal

AAP logoAAP 7/11/2016

Schoolgirl Rhianna Barreau hasn't been seen since she walked to a newsagency in suburban Adelaide to buy a Christmas card 24 years ago.

But South Australian police haven't given up hope of closing the cold case on the 12-year-old, who they believe was likely murdered after disappearing on October 7, 1992.

Her mother Paula came home at about 4pm to find the front door locked, the television on and a vinyl record on the living room floor.

The Christmas card Rhianna had bought for her American penfriend was unopened on the dining room table.

The cause of her disappearance during school holidays remains a mystery, despite the offer of a $1 million reward and immunity from prosecution for anyone who helps solve the case.

"She was a young girl who left behind a mother, father and brother who were ... heartbroken by what happened," Detective Superintendent Des Bray said in a statement.

"Police have not given up."

Rhianna was last seen near the junction of David Terrace and Acre Avenue in Morphett Vale. She was wearing purple shorts, a green 'hypercolour' T-shirt, white socks and white sneakers.

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