Police revealed later on Saturday that scuffles with protesters led to 155 arrests, many for breaching coronavirus restrictions. After the lockdown ends on Wednesday, Prime Minister Boris Johnson plans to impose further coronavirus restrictions.
Cops lining the streets were booed and met with chants of "shame on you", the BBC reported, as the demonstrators, many not wearing face masks, ignored requests to leave.
Ahead of the protest, Metropolitan Police released a statement warning anyone planning to travel to King's Cross that current lockdown measures do not permit massive crowds.
The Metropolitan Police said it used early intervention methods to disperse the illegal gatherings and that those who did not go home were arrested or issued with a fixed penalty notice. On which police commander for the event, Chief Superintendent Stuart Bell, said it was a "challenging day" for officers and thanked them for their work.
Traffic was temporarily blocked on Regent Street as police attempted to handcuff people on the ground in the middle of the road.
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"More than 150 arrests were made while policing today's protest in London".
The grassroots group Save Our Rights UK, which says it is working for democracy, appeared to be leading the protest, called Unite For Freedom - Time For Action.
The protesters, some dressed as Christmas elves, carried signs reading "All I want for Christmas is my freedom back", "Ditch the face masks" and "Stop controlling us".
The Met Police had urged people not to attend protests this weekend and warned those who attend risk enforcement action by officers. Tiered restrictions are slated to come into force when the wider lockdown ends.