A large crowd of young people was seen partying at Streatham Common in South London on June 25, defying government rules on outdoor gatherings.
Police arrived to disperse the group, the Evening Standard said, as the event was not licensed, and people in the UK are only allowed to gather in groups of no more than six.
In nearby Brixton, 22 police officers were injured during confrontations at an unauthorized music event the night before.
Also on June 25, officers had objects thrown at them, police said, while dispersing crowds at an unlicensed music event in Notting Hill. Credit: @Goran71913876 via Storyful