Teenage boy dies after stabbing at Sydney’s Royal Easter Show

A teenage boy is dead and another seriously injured after both were stabbed at Sydney's Royal Easter Show.

A brawl broke out at the crowded carnival ride area of the showground about 8pm on Monday, NSW Police said.

One of the teens had a critical stab wound to the chest and died while being taken to Westmead hospital.

NSW Ambulance Inspector Mark Whittaker said the teen was in cardiac arrest with a traumatic chest wound when paramedics arrived.

"Paramedics performed CPR and a number of other critical interventions at the scene before loading the patient for transport to Westmead hospital," he said in a statement.

"Unfortunately despite best efforts, he couldn't be resuscitated.

"There's no doubt this would have been a very confronting scene for the dozens of witnesses who were out to enjoy an evening at the Royal Easter Show."

The second teen was stabbed in the leg and was taken to Westmead hospital in a serious but stable condition.

A man was arrested and taken to Auburn police station.

Show visitors were moved out of the area, which is now closed, and a crime scene has been established.