They arrested 14 people on suspicion of breaching Covid-19 legislation and obstructing a highway.
The Bristol demonstration against increased police powers turned violent, resulting in officers being injured and seven arrests.
Hundreds of people are holed up at the Polytechnic University campus as protests rage on after six months.
Demonstrators in Paris clashed with riot police, while in Istanbul over 80 protesters were arrested. In Manila, activists burned a large effigy of President Rodrigo Duterte. Originally celebrated in the UK as a recognition of changing seasons, May Day has come to be linked with International Workers’ Day and global, large-scale protests for workers' rights.
One protester lost four fingers during clashes with riot police.
Riot police fired tear gas at demonstrators when they attempted to leave their pre-approved route.
There is a strong feeling of injustice and inequality all over poor London, and like the elderly woman in Hackney, people are tired of the police, and politicians, saying "I'll tell you what's fair".
Riot police have clamped down on parts of London after clashes broke out between officers and hooded youths on Sunday evening