The Bristol demonstration against increased police powers turned violent, resulting in officers being injured and seven arrests.
Scuffles broke out between demonstrators and police at an anti-vaccination and anti-lockdown protest at London’s Trafalgar Square.
Demonstrators could be heard singing 'Rule, Britannia' and seen squaring up to police as they blocked the A20.
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Black Lives Matter protesters in the US have reported instances of demonstrators being grabbed from the streets by federal police in unmarked vans.
There are fears of clashes between anti-racism protesters and far-right activists during demonstrations on Saturday afternoon.
From Bristol to Edinburgh, thousands of people joined protests across the UK.
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Dozens of similar demonstrations are set to take place around the globe to call for a more robust response to the crisis.
On Tuesday, the government proposed new social reforms in a bid to quell the unrest.
PM attacks demonstrators as they start fortnight of peaceful direct action on the climate emergency.