Police stopped an anti-lockdown protest in Trafalgar Square because the crowd “failed” to comply with social distancing rules.
The protesters were asked to leave and the force warned anyone staying could take action.
Officials clashed with protesters as officials tried to end the event. Bottles were thrown and police used batons against protesters, some leaving visible injuries.
Metropolitan Police officers held the crowd in Trafalgar Square and protesters threw water on them. Crowds also sang “choose your side” from the officers.
In a statement, city police said: “Crowds in Trafalgar Square have failed to meet the terms of their risk assessment and are putting the virus at risk.
“This invalidated their risk assessment and we told the organizers that they are no longer exempt from the regulations. We are now asking those in Trafalgar Square to leave. The officials will deal with crowds and inform them of this development.
“If you go now you can protect yourself and keep officials from taking enforcement action.”
Conspiracy theorist David Icke spoke to the thousands of people who had gathered in Trafalgar Square as protesters repeatedly chanted “freedom” as dozens of helmeted police officers gathered on the nearby street.
Thousands had rallied earlier when police warned protesters not to violate social distancing rules.
The protesters who protested the government’s lockdown measures cheered and clapped and shouted “We will win”.
The police had previously searched a man and confiscated a makeshift shield that he was wearing.