Two tourists were robbed and one of them assaulted at hot pools south of Rotorua, police say.
A 20-year-old Swiss man and his 26-year-old Korean girlfriend were at the pools on the Waiotapu Loop Road on Wednesday.
About 3am, a car arrived carrying up to four men and two women, who were described as rowdy and intoxicated.
As the Swiss man left the pools, he was hit over the head and items including electronic goods, jewellery and cash stolen from the camper van. The keys were tossed into the water.
The man needed stitches at Rotorua Hospital for a cut to his head.
Police are appealing to the public for any information.