Those arrests were for offences including breaching coronavirus regulations, assaulting a police officer and possession of drugs.
Officers made a number of early interventions to prevent people from gathering and to urge people to go home. As part of this, coaches transporting protestors into the capital were intercepted and those who did not turn back and go home were either arrested or issued with fixed penalty notices.
Chief Superintendent Stuart Bell, policing commander for this event, said: “This was a challenging day for Met, City of London and British Transport Police officers and I would like to thank them for the professionalism they have shown throughout the day.
“On Friday, we made it very clear how we would police this event, warning those looking to attend that they risked facing enforcement action if they attended a gathering in London. Today’s enforcement action is a direct result of those individuals deliberately breaking the law and at times, targeting our officers with aggression and causing disruption to the road network.
“Our policing plan will continue well into the evening and I would urge anyone who hasn’t already dispersed to go home. By doing so, you can avoid ending up facing enforcement action and help protect yourself and others during this health crisis.”