"The mostly peaceful demonstrations in Central London have finished. My thanks to the crowds who engaged with us and my colleagues for their hard work. There were 6 arrests for a range of offences and unacceptably 4 officers injured. I wish them a speedy recovery," Roper said on Twitter late on Saturday.
Earlier in the day, she tweeted that one demonstrator was arrested after throwing a bottle at police officers.
Coronavirus restrictions were lifted in the United Kingdom on July 19, although authorities still recommend wearing face masks and using the NHS Covid-Pass, which demonstrates proof of vaccination or a negative coronavirus test result.
On Saturday, five days after the lifting of COVID-19 restrictions, thousands of people gathered in central London to protest against vaccination and the coronavirus pass.