It comes just one day before the annual summer solstice celebrations.

Two campaigners from Just Stop Oil—a British environmental activist group focused on addressing human-caused climate change—sprayed two of the monoliths at around 11:00 a.m BST on Wednesday, Jun. 19.

Two Arrested

According to the Gazette & Herald, two people were arrested; Niamh Lynch, 21, from Oxford and Rajan Naidu, 73, from Birmingham. "Stonehenge at solstice is all about celebrating the natural world—but look at the state it's in!" said Lynch in a press release on the Just Stop Oil website. "We all have a right to live a life free from suffering, but continued burning of oil, coal and gas is leading to death and suffering on an unparalleled scale. It's time for us to think about what our civilization will leave behind—what is our legacy?"

The orange cornflour used to spray the monuments will be washed away by rain, said Just Stop Oil. However, according to the BBC, experts will need to assess the stones to see if lasting damage has been caused. "They are sensitive and they are completely covered in prehistoric markings which remain to be fully studied," said Mike Pitts, archaeologist and author of How to Build Stonehenge, to the BBC.