UK Police arrested 51 people over an anti-monarchy protest before King Charles’s coronation on Saturday with people holding hundreds of yellow placards saying "Not My King".
Protests also took place in Glasgow in Scotland and Cardiff in Wales, with participants holding up signs saying: "Abolish the monarchy, feed the people."
Photos circulated on social media showed police seizing demonstrators’ placards.
With the crown passing from Queen Elizabeth to her less popular son, republican activists, who were part of the protest said, they ‘hope Charles will be the last British monarch to be crowned’.
However, Police said the duty to prevent disruption outweighed the right to protest.
"We absolutely understand public concern following the arrests we made this morning," Commander Karen Findlay of the London Metropolitan police told Reuters.
"We received information that protesters were determined to disrupt the Coronation procession,” he said.
King Charles III was crowned in the United Kingdom’s biggest ceremonial event for seven decades, in the presence of the royal family, 4,000 British and Commonwealth troops, about 100 world leaders and a television audience of millions, reports said.
The king swore oaths by placing his hand on the Bible, and the Archbishop administered the Oath; “Will you solemnly promise and swear to govern the Peoples of the United Kingdom of Great Britain and Northern Ireland, your other Realms and the Territories to any of them belonging or pertaining, according to their respective laws and customs.”

The King replied, “I solemnly promise so to do.”
He was then hidden from watching eyes by a screen for the most sacred part of the ceremony when he was anointed on his hands, head and breast with holy oil consecrated in Jerusalem.
Moreover, gun salutes were fired at the Tower of London and across the capital, the nation, in Gibraltar, Bermuda and at ship ports.
World leaders from Russia, Belarus, Myanmar, Afghanistan, Syria, Venezuela and Iran did not attend the ceremony.