The Bronze Age cairns at Dunkery Beacon on Exmoor have been daubed with pro-hunting graffiti and a viewpoint indicator has been damaged.

The words "no hunt-no deer" were sprayed over the cairns, between mid-afternoon on Sunday and early Monday morning.

A spokesman for the National Trust, which owns the land and monuments, says the damage is a devastating blow to the heritage of Exmoor.

Removing the black and orange paint will be costly and time-consuming for the trust.

Police are appealing for anyone who was near the summit of Dunkery between 1500GMT on Sunday and dawn on Monday to come forward.

Dunkery Beacon is the highest point on Exmoor, rising to more than 1,700ft.

It is on a stretch of the moor which is popular with walkers.