Three people have been killed following reports of a head-on crash on State Highway 25 near Thames.
Another person is in a critical condition.
Police were called to the two-vehicle crash near Kopu Bridge just before 8:30pm.
There were two people in each vehicle, who were left trapped after the initial crash. Three of the four later died.
Diversions are in place at the Kopu roundabout, and at SH25 and Hauraki Rd.