"These marches and protests have been subverted by violence and breach current guidelines. Racism has no part in the UK and we must work together to make that a reality," he wrote.

Home Secretary Priti Patel condemned the violence as "appalling and shameful" the "desecration" of a memorial to murdered Keith Palmer during the far-right protest in Westminster. She said a "small minority" had behaved with "extreme thuggery."

For his part, Khan wrote on Twitter: "Millions of Londoners will have been disgusted by the shameful scenes of violence, desecration and racism displayed by the right-wing extremists who gathered in our city today."

"In the face of attacks and abuse, our police did a fantastic job to control the situation. Thank you."

The latest protests took place following a series of anti-racism demonstrations across Britain, sparked by the U.S. police killing of George Floyd, an unarmed African American.

Floyd, 46, died on May 25 in the U.S. city of Minneapolis after a white police officer knelt on his neck for nearly nine minutes while he was handcuffed facing down and repeatedly said he couldn't breathe.

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