Police and SES volunteers are conducting a search along Maslin Beach after the discovery of what is suspected to be two human bones.
The first bone was discovered by a member of the public on Tuesday 16 February and has been analysed by forensic experts, who believe it is a forearm. The other is thought to be a rib.
It is unclear whether the bones belong to the same person.
Police are reviewing all existing missing persons.
Detective Chief Inspector Scott Fitzgerald, pictured, said the remains have not been there for longer than a year.
Police urge anyone who discovers any bones along the southern beaches particularly in the areas of Maslin Beach, Seaford, Moana, Southport and Port Noarlunga to please contact police immediately on 131 444.
Anyone with information on the incident or any missing persons is asked to please contact Crime Stoppers on 1800 333 000.
Photo of Detective Chief Inspector Scott Fitzgerald, speaking at a press conference during the investigation, supplied