UK police arrested two people on Wednesday after activists sprayed an orange substance on Stonehenge, the renowned prehistoric UNESCO world heritage site in southwest England. Footage posted on social media showed activists spraying a cluster of the megalithic standing stones with the orange substance from a small canister. Wiltshire Police said in a statement that it had arrested two people following the incident. “Officers attended the scene and arrested two people on suspicion of damaging the ancient monument,” the force added. “Our inquiries are ongoing and we are working closely with Engl…