The air ambulance helicopter attended an incident on Roseberry Topping as 999 crews waited at the base. Pictures show Cleveland Police vehicles, ambulances and the Great North Air Ambulance craft ...

Ollie Henson, from Cleveland Mountain Rescue, was leading a group to the top of Roseberry Topping, a hill on the edge of the North York Moors, when he spotted the rocks being thrown.

Their current condition remains unknown. A NEAS spokesperson said: "We were called to an incident on Roseberry Topping at Aireyholme Farm in Middlesbrough on Sunday, April 27 at 6.41pm.