Police are investigating after a young man was found dead in his family's house in Hunua today.

Officers were called to the address on Nairn Rd at 12.44pm after being contacted by relatives.

The man, in his 20s, was deceased when they arrived and a pathologist was asked to come to the scene.

A police spokesman said the pathologist had deemed the death to be suspicious.

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"One line of inquiry we are pursuing is whether or not [the man] was assaulted whilst out the previous night."

A scene guard would remain in place overnight with the investigation set to commence in full tomorrow.

The family, who were being cooperative, were being supported by police.

It was not known at this stage what the man had been doing last night.