Schoolboy goes into cardiac arrest after fall at Mona Vale Public School

An eight-year-old boy has been rushed to hospital in a serious condition after a fall at a primary school on Sydney's northern beaches.

CareFlight were called to Mona Vale Public School about 11.30am after the accident.

It is understood the boy fell from a height, but it is unclear what he fell from or how high the fall was.

The boy hit his head and went into cardiac arrest. He has been taken to the Children's Hospital at Randwick in a serious condition.

NSW Police and Ambulance both attended the scene.