Hundreds of people took to the streets of central London in protest following the death of Sarah Everard.
Demonstrators gathered in Parliament Square and crossed Westminster Bridge on Monday evening.
They were demonstrating against a policing bill being heard in parliament that would give officers greater control over protests.
Those gathered were also there in tribute to Ms Everard, a 33-year-old marketing executive who went missing on 3 March.
Her remains were later discovered in woodland in Kent and a Metropolitan Police officer, Wayne Couzens, 48, has been charged with her kidnap and murder.
Four people were arrested and two were fined following Monday’s protests in central London, which came two days after a vigil for Everard in Clapham Common was marred by police clashing with crowds.
On Monday, the Metropolitan Police said it had “maintained an appropriate policing plan” during the protest action around Parliament Square, Trafalgar Square and parts of the West End.
Protesters blocked “a number of roads” and caused traffic disruption, the force added.
Many protesters chose to leave the area when encouraged to do so by officers, but others remained in the Westminster area.
Temporary Deputy Assistant Commissioner Jane Connors said: “Whilst I understand why people feel the need to express their views at this time, we must remember that we are still in the middle of a pandemic, and that there is the constant risk of transmitting the coronavirus.
“Our officers were once again out on the streets, with the primary role of trying to ensure people’s safety during this health crisis.
“Despite many people adhering to officers’ instructions to leave the area and go home, we had to take some enforcement action as the evening progressed.”
Demonstrators protested against the police’s handling of the Clapham vigil and the government’s Police, Crime, Sentencing and Courts Bill.
If passed, the bill, which is being debated this week, would allow police to impose start and finish times on protests and set noise limits.