A spokesman for English Heritage said: “Obviously this is extremely upsetting, and our curators are investigating the extent of the damage. Stonehenge remains open to the public.”
Rishi Sunak, the Prime Minister, said: “This is a disgraceful act of vandalism to one of the UK’s and the world’s oldest and most important monuments. Just Stop Oil should be ashamed of their activists.”
Sir Keir Starmer, the Labour leader, said that “Just Stop Oil are pathetic” after learning of the incident.
A Just Stop Oil spokesman said: “Continuing to burn coal, oil and gas will result in the death of millions. We have to come together to defend humanity or we risk everything.
“Failure to commit to defending our communities will mean Just Stop Oil supporters, along with citizens from Austria, Canada, Norway, the Netherlands and Switzerland, will join in resistance this summer if their own governments do not take meaningful action.
“Stone circles can be found in every part of Europe showing how we’ve always co-operated across vast distances – we’re building on that legacy.”