Two men are in intensive care and a third has serious head injuries following separate incidents during a weekend of violence.
Police were called to a Wanaka house party where a fight had erupted between three men at around midnight on Friday, leaving one with serious head injuries.
He was taken by ambulance to Dunstan Hospital for treatment.
Police charged a man a short time later with intent to injure and possession of an offensive weapon.
In separate incidents overnight on Saturday, two men were treated for serious injuries.
A man underwent surgery at Tauranga Hospital today after he was taken to the emergency department with stab wounds to his chest just before 3am.
The man remained in the intensive care unit in a serious condition, said a hospital spokeswoman.
Inspector Ben Offner said police were following positive lines of enquiry.
A south Auckland man was also in a serious condition after suffering life-threatening wounds following a domestic dispute.
Police were called to a residential address in Favona in relation to a domestic dispute at about 4.45am today.
He was taken to Middlemore Hospital, where he received urgent treatment.
Another man from the address is helping police with their enquires, and they are not seeking anybody else in relation to the incident, said police.