Police are investigating two incidents which happened in the East Coast overnight.
The first incident occurred last night about 11pm in Kaiti.
A group of people turned up at a party uninvited and a fight occurred, says Senior Sergeant Maui Aben.
As a result of the incident three people from the uninvited group required hospital treatment for stab wounds.
The injuries are considered non-life threatening.
The injured were two women aged 16 and 20 years and a man aged 22 years.
The incident is gang related.
The second incident involved a 24-year-old man who presented himself to the Tairäwhiti Police at about 5am.
He was bleeding from the neck and required hospital treatment.
It is believed the man was struck with a bottle.
Police do not believe the two incidents are related.
Source: New Zealand Police.