Two children killed in SA road crash

Two children have been killed and three others injured in a car crash north of Adelaide.

Police said a 14-year-old girl and a five-year-old boy died at the scene at Lower Light.

The injured included two girls aged eight and 10 and a seven-year-old boy, who were all taken to the Women's and Children's Hospital in Adelaide with serious injuries.

A 31-year-old woman who was driving the car when it rolled was also admitted to the Royal Adelaide Hospital in a serious condition.

Major crash investigators are looking into the circumstances surrounding the incident, which occurred about 7am (CDST).

The deaths have taken the state's road toll for 2014 to 21. It was 22 at the same time last year.