Conservationists are considering using CCTV to protect Oxfordshire's Rollright Stones following the latest vandal attack.

At the weekend, vandals daubed swastikas on the warden's hut at the ancient stones near Chipping Norton.

They set fire to a stone in the stone circle and damaged a 1930s information plaque next to the King's Stone. They also stole £7 from a cash box at the hut.

George Lambrick, chairman of the Rollright Trust charity, said: "We are considering installing some kind of CCTV system here to deter further attacks.

"There are 59 different species of lichen that grow on the stones and we will be trying to find out if the fire has damaged them."

The circle of 70 stones, said to be one of the most important in the country and believed to be 3,500 years old, was seriously damaged in April 2004, when vandals splattered them with yellow paint.

The attack caused an estimated £50,000 worth of damage.

Claire Gourlay, a spokesman for Thames Valley Police, said: "We are investigating this attack and an officer has visited the site to assess the potential benefit of scenes-of-crime officers attending to gather forensic evidence."

Call police on 08458 505505 if you have any information.