More than 100 people were arrested after violent demonstrators attacked police in central London, drawn by Black Lives Matter protests.
Football hooligans and far-right groups descended on the capital, vowing to “defend” memorials from protesters after the Westminster statue of Winston Churchill was covered up for protection.
Boris Johnson warned that anyone attacking police would face “the full force of the law”, and condemned the “racist thuggery”.
Hundreds of people defied a 5pm police curfew in the capital, after a day of clashes near the Houses of Parliament and Trafalgar Square.
Demonstrators repeatedly assailed officers in riot gear with missiles, smoke grenades, bottles and flares.
There were a number of clashes with police in riot gear as crowds chanting "Tommy Robinson" and "England" while raising their arms surged towards lines of officers.
Violence also erupted at Waterloo station as activists chased counter-protesters, overwhelming police.
The home secretary condemned as “shameful” the “desecration” of a memorial to PC Keith Palmer, the policeman who was killed trying to defend parliament from a terror attack, when a man was seen urinating right next to it.
Catch up on events as they happened.
Paul Golding, leader of the far-right group Britain First, told PA news Agency they had turned out to "guard our monuments".
Police in London have told those planning on joining Black Lives Matter demonstrations that they must be off the streets by 5pm today.
In an attempt to avoid a repeat of last week's violent clashes with police, protesters have been told they must stick to the planned route that will run from Hyde Park to Whitehall.
The force fear the anti-racism protests - that were sparked by the death of George Floyd in the US last month - could be hijacked by counter-demonstrations by far-right groups.
Boris Johnson has been accused of “stoking division and fear” after he claimed the Black Lives Matter protests had been “hijacked by extremists intent on violence”, Zoe Tidman reports.
Critics suggested the prime minister was seeking a "culture war" to distract from his handling of the coronavirus crisis after he unequivocally rejected calls to remove statues of historic figures with links to racism and slavery.
Mr Johnson urged people to stay away from planned demonstrations this weekend, claiming they would “end in deliberate and calculated violence.


Former Conservative minister Sir Nicholas Soames told the Daily Telegraph the incident, in which the word "racist" was scrawled on the monument, shows British society has "lost its compass".
It comes as Home Secretary Priti Patel reportedly called for the statue in Parliament Square to be uncovered "immediately".
Sir Nicholas backed PM Boris Johnson's condemnation of disorder during last weekend's Black Lives Matter protests, and said London mayor Sadiq Khan was right to heed police advice and board up the statue and the nearby Cenotaph.
Police have been granted extra stop and search powers covering large parts of central London after learning people are "coming into London to cause harm" during weekend protests and are "likely to bring weapons".The section 60 order is in place from 11am on Saturday to 2am on Sunday in the areas of:
- Bayswater Road across to Holborn
- Kingsway to Elephant and Castle
- Kennington Lane to Battersea Park Road
- Kensington Road to Queenstown Road
The Metropolitan Police said in a statement: "As part of our planning for this weekend, we have learnt some people are coming into London to cause harm and are likely to bring weapons with them.
"The Met have been working hard to ensure those people who are coming to London to voice their concerns are kept safe. Unfortunately, we are also aware there are some who are distorting that message and we believe are intent on causing harm.
"Due to the information received, and our need to keep people safe, we are now implementing a section 60 into the areas of protests."
The London faction of Black Lives Matter cancelled an official demonstration on Saturday after the Democratic Football Lads Alliance (DFLA), Tommy Robinson and Britain First called for supporters to travel to the capital.
Our home affairs correspondent Lizzie Dearden explains:
Glass bottles, including a large vodka bottle, and cans have been thrown towards the line of helmeted officers.
At least one officer had a baton held up towards the protesters who are chanting "You let your country down", towards them.
Labour MP and shadow Home Office minister Jess Phillips has tweeted: "Watching scenes today outside my place of work is harrowing.
"These people have caused me to be scared in my home, at my work. My family and I have to carry devices for our security.
Home secretary Priti Patel has condemned scenes of police being pelted with bottles after clashing with large crowds in central London as "unacceptable thuggery".
Hundreds of people converged on Parliament Square this morning after far-right groups, including Britain First, called on supporters to "guard the monuments".
But instead they have been filmed kicking down barriers and throwing missiles at police in riot gear.
London mayor Sadiq Khan has reiterated calls for people to stay away from protests today, warning that "perpetrators will feel the full force of the law".
Police are trying to stop them getting to Hyde Park where a Black Lives Matter demonstration, which has largely been peaceful, is taking place.




Some demonstrators have jumped a fence into the grounds of Westminster Abbey in order to leave.
Several hundred people have gathered at the Cenotaph in Bristol city centre.
Protesters held up 'All Lives Matter' banners, but denied they were far-right supporters.
My colleague Vincent Wood is at the scene of the protests near the Cenotaph.

