SYDNEY - Australian police have launched an investigation after the bodies of two people were found at a home in Sydney's northern suburbs.

Emergency services were called to conduct a welfare check at the home in Forestville, about 12 km north of central Sydney in the state of New South Wales (NSW) on Wednesday, NSW Police said in a statement on Thursday.

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Police officers attended the scene and found the bodies of a man and a woman in an outbuilding at the rear of the property.

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The statement said the bodies have not yet been formally identified but that the man is believed to be aged in his 40s and the woman in her 50s.

A crime scene was established and police have commenced inquiries into the circumstances of the deaths with the assistance of the homicide squad.