Six people are injured, at least one critically, following a crash in the Kaipara District.

Two vehicles were involved in the crash, which happened shortly before 9pm on State Highway 1 in Topuni.

In a statement, police said initial indications were six people were injured - with injuries ranging from critical to moderate.

A helicopter had been dispatched to the scene.

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Diversions were in place at Kaiwaka and Te Hana.

The road around the crash was closed and motorists were being advised to avoid the area.