He said the crews had been attending for the past 20 minutes but couldn't provide any comment on the nature of the crash or health statuses of those involved.
Earlier today, one person died after two cars flipped in a crash south on SH1, south of Kawakawa in Northland.
Three other people were taken to Northland Base Hospital after the incident, which occurred about 4.30pm, a St John spokesperson said.
Two were taken to hospital in a critical condition and the third in a serious condition.
Three helicopters and five St John vehicles also attended.
The road was closed for about four hours after the crash. Police confirmed about 8.30pm it was reopened to the public.
Police wanted to thank motorists for their patience after the closure and said an investigating into the crash is ongoing.
Police said the male passenger of one of the cars died at the scene.