Far-right groups are threatening to riot over Brexit amid warnings that some of Boris Johnson’s language is “calling to” nationalists.

The Metropolitan Police said it was “ready to share resources across the country” if disorder breaks out at protests planned for Saturday.

A demonstration called by the Democratic Football Lads Alliance (DFLA) is expected to draw the largest numbers in Westminster, as Brexiteers take to the streets in Manchester, Birmingham and other cities.

The protests were organised amid a surge in anger over parliament’s moves to prevent a no-deal Brexit with a bill that was approved by the House of Lords on Friday.

Extremists using numerous far-right channels on the encrypted Telegram messaging app calling MPs who backed the bill “traitors” and “scum” while planning rallies.

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(AP Photo/ Kirsty Wigglesworth) Kirsty Wigglesworth AP Opposing protesters flock to parliament on would be date of Brexit A pro-Brexit protester holds a sign next to a statue of Winston Churchill at the March to Leave demonstration in London, Britain March 29, 2019. REUTERS/Toby Melville TOBY MELVILLE Reuters Opposing protesters flock to parliament on would be date of Brexit Brexit demonstrators in Parliament Square in Westminster, London. PRESS ASSOCIATION Photo. Picture date: Friday March 29, 2019. See PA story POLITICS Brexit. Photo credit should read: Jonathan Brady/PA Wire Jonathan Brady PA Opposing protesters flock to parliament on would be date of Brexit Pro-Brexit protesters hold signs and wave flags at the March to Leave demonstration in London, Britain March 29, 2019. REUTERS/Toby Melville TOBY MELVILLE Reuters Opposing protesters flock to parliament on would be date of Brexit epa07471421 Pro-Brexit protesters gather outside of the Parliament for Nigel Farage's 'March to Leave' in London, Britain, 29 March 2019. MPs rejected Prime Minister's May EU withdrawal agreement earlier in the day. EPA/NEIL HALL NEIL HALL EPA Opposing protesters flock to parliament on would be date of Brexit A Brexit supporter sips a can of Stella in protests outside of the Houses of Parliament AFP/Getty Opposing protesters flock to parliament on would be date of Brexit Dedicated anti-Brexit campaigner Steve Bray and likewise pro-Brexit campaigner Joseph Afrane go head to head near the Houses of Parliament AFP/Getty Opposing protesters flock to parliament on would be date of Brexit A pro-Brexit marching band in Parliament Square Getty Opposing protesters flock to parliament on would be date of Brexit Remain supporters wave EU flags from a bus in Parliament Square PA Opposing protesters flock to parliament on would be date of Brexit A Brexit supporter shouts slogans outside parliament EPA Opposing protesters flock to parliament on would be date of Brexit A Brexit supporter protests outside parliament Reuters Opposing protesters flock to parliament on would be date of Brexit A Brexit supporter protests outside of the Houses of Parliament Getty Opposing protesters flock to parliament on would be date of Brexit Brexit supporters protest outside of the Houses of Parliament REUTERS Opposing protesters flock to parliament on would be date of Brexit A pro-Brexit flag is waved in Parliament Square AP Opposing protesters flock to parliament on would be date of Brexit The March to Leave nears the Houses of Parliament Reuters Opposing protesters flock to parliament on would be date of Brexit A Brexit protester holds a sign outside parliament EPA Opposing protesters flock to parliament on would be date of Brexit Brexit supporters carry the coffin of democracy AFP/Getty Opposing protesters flock to parliament on would be date of Brexit Brexit supporters march outside parliament AFP/Getty Opposing protesters flock to parliament on would be date of Brexit Brexit supporters take part in the March to Leave protest in London PA Opposing protesters flock to parliament on would be date of Brexit Brexit supporters protest outside parliament AFP/Getty Opposing protesters flock to parliament on would be date of Brexit A Brexit supporter holds a sign outside the Houses of Parliament Getty Opposing protesters flock to parliament on would be date of Brexit A man holds satirical paintings of politicians Reuters Opposing protesters flock to parliament on would be date of Brexit An pro-Brexit float on the March to Leave march in London Reuters Opposing protesters flock to parliament on would be date of Brexit Far-right activist Tommy Robinson addresses protesters outside the Houses of Parliament Getty Opposing protesters flock to parliament on would be date of Brexit A Brexit supporter outside the Houses of Parliament Reuters Opposing protesters flock to parliament on would be date of Brexit A Tommy Robinson supporter arrives at the Houses of Parliament Getty Opposing protesters flock to parliament on would be date of Brexit A jogger gestures rudely at a Brexit supporter outside of the Houses of Parliament AFP/Getty Opposing protesters flock to parliament on would be date of Brexit A Brexit supporter outside the Houses of Parliament PA

One member of a chat group purporting to contain supporters of Nigel Farage’s Brexit Party threatened “Brexit or we burn the country” after a fellow user called for unrest like that seen in Hong Kong.

A member of another group used by Britain First supporters wrote: “I predict a riot, then serious civil unrest until the 31st. Protect your loved ones and property, Britain is about to go in to biblical battle.”

“It’s time to f*** s*** up,” another post read. “Let’s f***ing smash um! Britain take to the streets!”

Another person wrote: “It needs to kick of Saturday big time.”

In the same chat, which includes racist and Islamophobic memes, a user called for “some good old civil unrest”.

In a different group for “patriots”, people were sharing photos of smoke grenades they had bought online to take to the protests.

The Metropolitan Police said it was prepared for the demonstrations and the possibility of further protests in the run-up to Brexit.

“To date, protests have been largely peaceful and we have no intelligence at this time to suggest that will change,” a spokesperson added.

“Our officers are well trained to maintain public order and stand ready to share resources across the country if any disorder breaks out. We will not hesitate to take necessary action against anyone who deliberately chooses to act outside the law.”

Law to block a no-deal Brexit passed by House of Lords

Senior police officers have been calling for politicians and other political figures to avoid worsening tensions with inflammatory language.

Martin Hewitt, chair of the National Police Chiefs’ Council, issued a warning over the “incredibly febrile atmosphere”.

“If you’re in a position where you know you’re going to be listened to, you need to be very careful about the language you are using so it doesn’t end up with consequences that weren’t intended,” he urged.

Last month, the head of UK counterterror policing said all public figures should be “bringing society together” as Brexit worsens polarisation.

“We should be really careful about what we say, we should be balanced, because there is no doubt in my mind that it has an effect,” assistant commissioner Neil Basu previously told The Independent.

The prime minister has been forced to defend remarks where he compared Muslim women to “letterboxes” last year after research suggested they caused a 375 per cent rise in Islamophobic hate crimes.

Speaking in the House of Commons on Wednesday, Mr Johnson said the comments had been part of a “strong liberal defence of everybody’s right to wear whatever they want in this country”, and refused to apologise.

In the same session, he characterised a bill proposed by opposition parties to prevent a no-deal Brexit as a move against the “democratic will of the people of the UK”.

Mr Johnson described the proposed law as a “surrender bill” eight times during the session, and the term was then repeated by extremists.

The deputy leader of far-right group Britain First, Jayda Fransen, is among those supporting Mr Johnson (PA)

Experts said the prime minister and some other pro-Brexit politicians were “using the language of the far right” and playing into extremist narratives.

Chloe Colliver, who leads the digital research unit at the Institute for Strategic Dialogue think-tank, said that by using the phrase “surrender bill” and positioning himself as enacting the “will of the people”, Mr Johnson was “calling successfully to a nationalist interpretation of the Brexit debate”.

“It seems very purposeful to me and it really harks back to the Second World War nostalgia in this debate, which plays powerfully to the far right and nationalist groups,” she told The Independent.

“They don’t understand the mechanisms and decisions being made on their behalf, and that’s a ripe opportunity for these groups to step in with a simple narrative that pits them against everyone else.”

Mr Johnson is currently receiving substantial support from key far-right figures, including former Britain First leader Jayda Fransen, who praised him for “purging the traitors” in his party and called on others to fall behind him.

The operators of Tommy Robinson’s official Telegram channel called on people to “back Boris”, while supporters shared memes depicting him as Winston Churchill.

Ms Colliver warned that if the far right feel Mr Johnson is “in their corner”, it may reduce unrest in the short term but make them feel that their ideals have mainstream support.

She said the political stalemate over Brexit was undermining faith in democratic processes, and being “used to channel violent undemocratic objectives to a newly broad and receptive audience in the UK.”

Dr Joe Mulhall, senior researcher at Hope Not Hate, said far-right groups had seized upon Brexit as a nationalist cause and used it to gain mainstream support.

He said the global extreme right-wing had celebrated the result of the 2016 referendum, but then worked the following delays into a “narrative of betrayal” by “elites”.