Join the police search for Australia's missing children

There are thousands of people waiting for a lost loved one to return home. Australia has 2,500 unsolved missing person cases and 750 unidentified bodies.

Detectives continue to search for these missing Australians and have released their case files hoping details of the disappearances could unlock crucial evidence.

AFP's online "investigative board" peers into Australian cold case files including vital clues provided by police.

No one has seen Melissa Brown since she and her mother Rosemary left their home at 1.30am on May 7, 2000 to find her brother.

Two months later, on July 2, the 33-year-old mother's body was found in the mangroves of Garden Island, 15 kilometres north west of Adelaide CBD.

Police fear the 15-year-old girl was also murdered and a $1 million reward has been offered for information leading to a conviction.

The mother and her two children had been evicted from their caravan at the Windsor Gardens Caravan Park in Adelaide and were staying with a friend named Mark Nicholls.

Mr Nicholls had a neighbouring caravan at Windsor Gardens and invited the family to move in. But then all four tenants were evicted from the park three days later, on 7 May 2000.

They slept at the Garden Island boat ramp in Mr Nicholls' caravan and had arranged to move the caravan to a friends backyard in Blair Athol.

Ms Brown would be 38-years-old.

Craig Taylor and his two older sisters woke up in their grandparent's seaside shack in Coningham, south of Hobart, on the morning of September 3, 1993.

The family lived in Launceston but were visiting their mother's parents during the school holidays.

The 10-year-old boy made toast for himself and his mother. Then she asked him to get ready for a shopping trip in Kingston, Tasmania.

But Mrs Taylor couldn't find her son when she was preparing to leave the house.

She unsuccessfully searched the area and left for Kingston at around 11.30am. He has not been seen since.

Mr Taylor would be 40-years-old.

Rahma El-Dennaoui was 19-months-old when she disappeared from a bed shared with two of her sisters.

A land and air search found no trace of the baby and a 2012 coronial inquest failed to find a convincing explanation for her disappearance.

She was with her parents and seven siblings at their home in Lurnea, south-west Sydney on November 10, 2005 .

The three sisters were in a double bed below a window and police believe the baby was abducted during the night.

A reward of $250,000 is on offer for information. Rahma El-Dennaoui would be 19-years-old.

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