Five people have been injured, one critically and three seriously, following a crash on State Highway 30 in Waikato.
Emergency services were alerted to the two-vehicle smash near Kopaki about 6.55pm.
A Hato Hone St John spokesman confirmed they were still responding to the incident shortly after 8pm, with two ambulances, a rapid response vehicle and a helicopter in attendance.
A further two helicopters and an operations manager were also en route.