There are reports of a serious incident at the Lightwater Valley theme park near Ripon.
Yorkshire Air Ambulance have said a child had been taken to Leeds General Infirmary.
North Yorkshire Police said in a statement:
Police were called to reports of a medical incident involving a child at Lightwater Valley theme park near Ripon at 11.30am today.
Officers are currently at the scene. Further updates will be provided when available.
Further details as we receive them.