A baby is missing off the coast of South Australia after the bodies of a mother and her toddler were pulled from the ocean.

Emergency services were called to the state’s southernmost coastal town, Port Macdonnell, at about 11.15am on Monday after a car was found with its engine running.

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Officers launched a search and found two bodies in the ocean a short time later.

They have been identified as a 36-year-old woman from Compton, near Mount Gambier, and her toddler.

Crews are searching for a missing infant.

“Police have grave concerns for the child’s safety,” a South Australia police spokesperson said.

Detectives and forensic specialists are travelling to the scene.

Police are urging anyone who may have seen a white Isuzu MUX, registration S592BJR, to contact Crime Stoppers.