A woman was stabbed in the arm during a fight in the street with another woman in Masterton on Tuesday night.
Detective senior sergeant Scott Miller said police received a call around 8pm and discovered ambulance staff outside a Bannister Court address attending a woman in her twenties who was bleeding profusely from a stab wound on the back of her arm.
He said she was taken to Wairarapa Hospital and transferred to Wellington in the early hours of the morning in a stable condition.
Mr Miller said another woman has been arrested and will appear in court this week.
He said police have conducted interviews with residents and a scene examination but would welcome more information.
"Obviously, anyone in Bannister Court, we would be interested in speaking with them."
He said it was not a party situation and the street was known as "quite a quiet street".