A woman is being flown to Dunedin Hospital with serious injuries following a collision between two cars and a truck in Otago.
The crash happened on State Highway 1 at the railway crossing in Reidston, south of Oamaru, about 12pm.
Two other people sustained moderate injuries in the crash, a St John spokesman told Newshub.
A police spokesperson said the road was closed with diversions in place.
Police said the Serious Crash Unit has been advised.