A man is in a serious condition in hospital after allegedly being assaulted in a South Auckland suburb early this morning.

Police and emergency staff were called to a property in Ōtāhuhu about 7am after reports of a serious incident.

A police spokesman said on arrival officers found a man with serious injuries. He was taken to hospital for treatment.

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"A second man was at the address has been arrested and is in custody,'' police said.

Police staff remain at the scene and a scene examination is under way.