Police are hunting for a person in the Auckland suburb of Parnell after an attack at a backpackers.
One person has been seriously injured and was transferred to Auckland City Hospital, according to St John.
Another person is already in custody and it's understood the police Eagle helicopter has been dispatched.
The incident happened at the City Garden Lodge in Parnell.
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"We received a report of an assault at an address on St Georges Bay Rd at around 4.39pm," police said in a statement.
"One person has been injured, we don't have an exact status as such at this stage.
"One person is in custody and police staff are doing area inquiries to locate one other person."
Police said no further information was available yet as to the circumstances of the incident "at this early stage".
A photographer at the scene said neighbours reported hearing yelling and fighting this morning.
A female could be seen being taken away in handcuffs by police, while a neighbour said a male had fled the scene.
Three ambulances and nine police cars are at the scene, including a police dog team.