Serious crash closes State Highway 1 north of Dunedin

State Highway One at Palmerston, Otago, is closed due to a serious crash involving two cars. 

Police (file picture). Source:

Police say one person may be critically injured. 

Emergency services were called to the scene at Flag Swamp, north of Dunedin just before 12pm.

Diversions are in place and motorists are advised to expect delays and avoid the area if possible.