On Saturday 26 June 2021 there was a massive protest against government regulatory abuse in the UK.
Some protesters were seen throwing tennis balls at the Houses of Parliament. One protester, who did not wish to be named, said: “They have little messages on them. Most of them are not very nice.” – BBC Report
Image was assembled with screen-capped stills from a helicopter video posted on Twitter.
Update: BBC NEWS estimated the crowd size.