A protester was detained on Wednesday after hurling eggs and vitriol at King Charles III and the Queen Consort Camilla.
The royals were attacked as they walked in the northern England city of York through Micklegate Bar, a medieval gateway where monarchs are traditionally welcomed to the city.
Video footage showed several eggs in motion and smashed on the ground. None appeared to hit the royal couple, who continued to greet crowds.
One of the eggs appeared to be fended off by the sheriff of York, Suzie Mercer, who was part of the group of officials welcoming the king.
Several police officers could be seen grappling with a man at a crowd barrier.
Britain’s PA news agency reported that he booed and shouted “This country was built on the blood of slaves” as he was being detained.
Other members of the crowd tried to drown him out by chanting “Shame on you” and “God save the King.”
Charles and Camilla traveled to York as part of a series of engagements around the UK marking the start of the new king’s reign. They also visited the city’s cathedral, York Minster, and unveiled a statue of the king’s mother, Queen Elizabeth II, who died in September after 70 years on the throne.