A person was seriously injured in a road rage incident in Whangārei that spanned more than 13km.
Detective Sergeant Paul Overton said the motorist was hurt in an alleged assault about 5.45pm on Monday.
The incident was believed to have started on Crawford Cres in Te Kamo and ended on Ngunguru Rd, on the Tūtūkākā Coast.
Overton said two people were arrested and spoken to. He believed more people may have been involved.
Police are appealing for information about the incident.