The incident came just a day before thousands are expected to gather at the roughly 4500-year-old stone circle to celebrate the summer solstice – the longest day of the year in the northern hemisphere.
English Heritage,which manages the site,said it was “extremely upsetting” and said curators were investigating the damage. Just Stop Oil said the paint was made of corn starch and would dissolve in the rain.
Video released by the group showed a man it identified as Rajan Naidu,73,unleash a fog of orange from a fire extinguisher-style paint sprayer at one of the vertical stones.
As voices can be heard yelling “stop,” a person wearing a cap and raincoat ran up and grabbed Naidu’s arm and tried to pull him away from the monument. A man in a blue shirt joined in and wrestled the paint sprayer away.
The second protester,identified as Niamh Lynch,21,managed to spray three stones before the first bystander in the hat stopped her.
Wiltshire Police said the pair were arrested on suspicion of damaging one of the world’s most famous prehistoric monuments and a UNESCO World Heritage Site.