He is suspected of having thrown an egg in the direction of King Charles III while traveling to Luton, north London, to meet with officials of this city, charities and visit a new Sikh temple.
British police said on Tuesday they arrested a 20-year-old man who was "detained for questioning" for "assault".
The country confronted with its slavery and colonialist past
In early November, a 23-year-old man was arrested in York, northern England, after throwing eggs at the new ruler as he walked and shook hands in the city center in company of his wife Camilla.
"This country was built with the blood of slaves", he would have shouted before being arrested by several police officers, at a time when the country is increasingly confronted with its slavery and colonialist past.
The suspect was later released on bail.
Last week, the royal family experienced a new controversy after the remarks deemed racist by a relative of former Queen Elizabeth II towards a black feminist activist during a reception at Buckingham Palace.
World
UK: Rishi Sunak calls for 'confronting' racism 'every time' after Buckingham incident
People
United States: William and Kate's visit disrupted by a racist scandal in Buckingham
King Charles III
England
UK
World
Miscellaneous facts