Three injured, one seriously, after collision between train and two cars in Otago

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.