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Western Australia Police officers were called to a rural property in Osmington, around 20 kilometres north-east of Margaret River, at around 5:15am local time on Friday.

Five adults were found inside the property and two other bodies were discovered outside in what police described as a shed that had been converted into living quarters.

Two firearms were also found at the scene.

Detectives from the Homicide Squad and Forensic Crime Unit are at the scene as part of the investigation.

The ages of the children and the adults have not yet been revealed.