Four people have died in a crash on State Highway 2 at Netherton on the Hauraki Plains.
Two other people have been rushed to hospital.
Two cars were involved in crash at about 7.40pm this evening.
SH 2 is closed between Fisher Road and School Road, and it's likely to remain closed overnight.
There are diversions in place.
Police say fog in the area is heavy at moment, and motorists need to drive with extreme caution.
Until next of kin have been informed police will be releasing no further details.