Strict public order conditions have been imposed in central London ahead of the annual Million Mask March on the anniversary of the failed gunpowder plot.
Thousands of protesters in Westminster will join anarchists from around the world on Sunday (November 5) lashing out against government surveillance and censorship of the internet among other issues.
The march is supported by notorious international hacker collective Anonymous, and those taking part wear masks of Guy Fawkes's face to commemorate his failed attempt to blow up Parliament in 1605.
The protests usually focus on Whitehall and Trafalgar Square, with 53 people arrested last year on suspicion of anti-social behaviour, violence, damage to public property and businesses, up from just four in 2012.
The march has often seen attacks on police officers and a "significant police operation" will be in place through Sunday night at "key locations in the capital".
The march must begin from Trafalgar Square by 6pm and follow a strict route down Northumberland Avenue, Victoria Embankment, Bridge Street, Parliament Square, Parliament Street, Whitehall, St. Margaret’s Street, Abingdon Street and Millbank where it must end by 9pm.
Static demonstrations can be held at Trafalgar Square, opposite Downing Street and at Parliament Square.
Anyone who strays from the directions or refuses to follow instructions from police is "liable to be arrested".
Chief Superintendent Elaine Van-Orden, said: “We police hundreds of public events and demonstrations in central London every year and we always facilitate peaceful protest.
"However, due to the previous history of this event, we have strong reasons to believe that peaceful protest is the last thing on the minds of some of those who will attend.
“Criminality at the event has increased year-on-year. Arrests have increased from four in 2012 to 53 in 2016.
"Last year, a number of fireworks and flares were lit and thrown into the crowds in Trafalgar Square and aimed towards police officers.
“Those who choose to behave like this are not protesters, they are committing criminal acts and we will endeavour to deal with them.
"We therefore have such serious concerns about this event on Sunday, November 5, that we have made the decision to impose conditions under the Public Order Act.
“Our message, as it was last year, is simple: if you wish to protest peacefully, that is your right and we want to work with you.
"If you commit criminal acts or breach the conditions of the event, you are liable to be arrested.”
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