One person had been confirmed dead after a triple vehicle crash in Northland, Ruakaka.
The crash happened on State Highway 1 at around 6:55pm, police said on Wednesday.
Two other people have been injured, but their injuries are not considered serious.
Diversions are in place along Springfield, Ormiston and Mountfield roads for light vehicles only, police said.
Heavy vehicles will be diverted through State Highways 12 and 14.
Another person has been killed in Hamilton in a motorcycle crash in Claudelands.
The Serious Crash Unit is examining the scene and the road is expected to be closed for some time.