LONDON (AP) — Two environmental activists have been charged over the spraying orange paint powder at the Stonehenge monuments in southwest England in June, police said Thursday.

Rajan Naidu, 73, and Niamh Lynch, 22, have been charged with “destroying or damaging an ancient protected monument, and intentionally or recklessly causing a public nuisance,” Wiltshire Police said in a statement. They are due to appear at Salisbury Magistrates’ Court on Dec. 13.

Soon after the spray attack at the UNESCO World Heritage Site, the group Just Stop Oil took responsibility and released video showing a man it identified as Naidu blast a fog of orange from a fire extinguisher at one of the vertical stones. The second protester, identified as Lynch, sprayed three stones before she was stopped. It said the paint was made of cornstarch and would dissolve in the rain.

Following the protest, English Heritage, a charity that manages hundreds of historic sites, said that experts had quickly removed the orange powder from the stones.

Stonehenge was built on a windswept plain in southern England in stages starting 5,000 years ago. Its origin and purpose remain somewhat of a mystery, though the stone circle aligns with the summer solstice sunrise and winter solstice sunset, drawing crowds of spiritualists, druids and sun worshippers.

The publicity stunt was among a long line of disruptive acts by Just Stop Oil to draw attention to the climate crisis. The protests have halted sporting events, sullied famous works of art and caused traffic jams. The acts have led to convictions, jail terms and widespread criticism.