Three people have been injured in a one vehicle crash on State Highway 1 near Hunterville.

Emergency services were alerted to the incident at 7.30am.

A St John spokesperson said two ambulances and a helicopter were at the scene.

One occupant is in a serious condition and has been transferred to Palmerston North Hospital via helicopter.

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The two other occupants have been transported by ambulance to Palmerston North Hospital in a serious and moderate condition.

More to come.