More than 100 people have been arrested following violent protests in London on Saturday, the Met Police has said.
Police were attacked by demonstrators, some of whom were far-right activists, after thousands gathered saying they were protecting statues.
PM Boris Johnson said: “Racist thuggery has no place on our streets.”
An investigation is also under way after a man was seen urinating next to a memorial of PC Keith Palmer, who was killed in the 2017 Westminster attack.
Separately on Saturday, a number of peaceful anti-racism protests were held in London and around the country.
Home Secretary Priti Patel said the “desecration” of PC Palmer’s memorial was “utterly shameful”.
Met Police Commander Bas Javid added: “We are aware of a disgusting and abhorrent image circulating on social media of a man appearing to urinate on a memorial to PC Palmer.
“We have immediately launched an investigation, and will gather all the evidence available to us and take appropriate action.”
MP Tobias Ellwood, who gave first aid to PC Palmer as he lay dying after being stabbed in the grounds of Parliament by Khalid Masood in 2017, said the image of the man urinating next to the memorial was “abhorrent”.
He told the BBC: “He was fully aware of what he was doing, he should step forward and apologise.”
Source: BBC