Two people were taken to hospital after getting injured at a "large party" in west Auckland on Saturday night, police say.
The incident on Springbank Lane in Te Atatu happened just before 2am. One person received a "superficial" stab wound, and the other was hit with a bat.
"Both were taken to hospital for treatment - one to Auckland Hospital the other to Waitakere Hospital," police said.
"Police believe this is an isolated incident and are speaking to a number of people."
Anyone with information is urged to call them on 105, quoting job number P043138458.