Police are investigating the death of a 65-year-old man who was discovered dead at an Auckland property.

"There was a gathering at the address and police were called to the scene after the man was found unconscious," police said in a statement.

Attempts to revive him by ambulance staff were unsuccessful.

"Police are treating the death as unexplained. A post mortem will be conducted this afternoon will determine the cause of death," police said.

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