Three people are injured, and one person is trapped in a three-car crash in Waikato.
Emergency services were called to the scene on State Highway One, just north of the Tahuna turn-off at Ohinewai, at 7.25pm.
Police said one of the injured people would be evacuated by helicopter.
They said traffic was backed up in both directions, and a diversion was being arranged, but the serious crash unit would take several hours to assess the area.