One person has died following a serious crash between two cars on State Highway 1 in Northland.

The incident took place around 10pm in Okaihau, just north of Kaikohe and near Old Valley Rd.

Police confirmed one person had died in the crash and four others were understood to be moderately injured.

A section of the road has been closed while the Serious Crash Unit and other emergency services are on scene.

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Anyone travelling to the Far North overnight is being asked to take the alternative route via State Highway 10.

Elsewhere, emergency services were called to the intersection of Great South Rd and Taka St in Takanini just before 10pm.

Traffic is being diverted around the crash.