Less than 48 hours into their holiday, two American tourists were the victims of a "vicious and unprovoked" attack in Northland - and one will need reconstructive surgery.
Sergeant Phil Le Comte said police were investigating the incident outside the Bay Adventurer Backpackers on Kings Rd in Paihia about 3am on Saturday.
"A vicious and unprovoked attack on two male American tourists, aged 22 and 23 years respectively, resulted in both being hospitalised overnight for their injuries."
While the pair were discharged from the Bay of Islands Hospital later, the 22-year-old will undergo reconstructive surgery at Middlemore Hospital in South Auckland in the next few days, Mr Le Comte said.
He said a weapon was not believed to be involved.
Mr Le Comte declined to comment on the number of people believed to be involved in the attack.
"At this time it is believed those responsible are in fact locals, which is both embarrassing and disappointing to police and medical staff involved," he said.
The tourists had been socialising in the centre of town but had made their way back to the Bay Adventurer Backpackers, where they were staying, when the bars closed at 1am.
Mr Le Comte said they were in the courtyard of the backpackers when the attack started.
The two tourists arrived in New Zealand with an associate on January 1 with the intention of travelling throughout the country for 10 days, starting in the Bay of Islands.
They are recent engineering graduates of the University of Montana.
Mr Le Comte acknowledged the attack did not reflect well on the region.
"It is an isolated incident that has ramifications for the Far North and New Zealand. It's not a good look for us."
It is not the first time tourists have become victims of crime in the popular seaside town.
On the same road as Saturday's attack, three English tourists were robbed at knifepoint on April 3, 2013. The robbers took their possessions and their car.
Police are appealing to any person who was in the vicinity of Kings Rd, Paihia, about 3am on Saturday to contact the Kerikeri station on (09) 407-9211.