It is the latest gaffe by former foreign secretary Boris Johnson, who once referred to Africa as "that country".
Prosecutors described how the 73-year-old was a "poster boy for disparate groups" protesting at the time.
Hundreds of people attended a march through the city centre on Saturday.
The university has apologised for fencing students in after weeks of frustration over online lectures and Covid outbreaks on campus.
"Any measures which stop people expressing dissent are deeply worrying and should be treated with suspicion," human rights group Liberty said.
Footage shows protesters dancing through aisles to the song We’re Not Gonna Take it.
The president's eldest son said he wasn't "jumping to a conclusion" on Kyle Rittenhouse, who killed two anti-racism protesters in Wisconsin.
Scotland Yard has been accused of sending "vague threats" to the environmental group on the basis of Covid-19 gathering restrictions – from which XR are exempt.
Kyle Rittenhouse, 17, was reportedly arrested in his hometown of Antioch, Illinois, 20 miles from the shootings in Kenosha.
District attorney Sim Gill has been accused of elevating charges against protesters who broke windows and splashed red paint on his office building.