Detectives from the Major Crime Squad are investigating the death of three people at a property in Jingili.

Police and St John Ambulance attended the property at 10.20am this morning after receiving a call from the caretaker.

"A crime scene was immediately established and forensics officers have examined the scene," said Detective Acting Superintendent Lee Morgan.

"The matter has been declared a Major Crime and is being treated as suspicious at this time."

The investigation remains ongoing and Police are asking anyone who has any information to call Police on 131 444 or Crimestoppers 1800 333 000.