British Prime Minister Boris Johnson condemned "racist thuggery" after far-right groups clashed with police in central London on Saturday.
Driving the news: The groups turned out after a social media callout to "protect the monuments" targeted by Black Lives Matter protesters, who canceled an official demonstration because of the "counter-protest," per the Telegraph. London police said over 100 people were arrested following clashes in Parliament Square. Police said Sunday morning they had arrested a suspect on suspicion of outraging public decency after images circulated of a white man urinating on a memorial to an officer who died stopping a terrorist outside the United Kingdom's Houses of Parliament in 2017.
Go deeper: In photos: Thousands of people gather around the globe for Black Lives Matter protests