Masked protestors are expected to descend on London for the Million Mask March on Bonfire Night.
Led by international 'hactivist' group Anonymous, the anti-establishment demonstration sees protestors march through the capital wearing Guy Fawkes masks.
First held in 2013, the march has set off from central London every year since with Anonymous calling for people from around the world to join on Monday, November 5.
Once a year, people gather at hundreds of cities from around the world, waving banners with anti-Government slogans written on them.
This is what you need to know about the march.
What is the Million Mask March?
The Million Mask March is part of a global anti-establishment movement spearheaded by Anonymous, with the masks inspired by the 2006 thriller V for Vendetta.
It aims to stand up to mass internet surveillance, austerity economics, official corruption, erosion of civil liberties and other causes.
The biggest events are in London and Washington, but protests have taken place in 800 cities in the past.
Thousands are thought to have taken part in the marches since its launch five years ago.
A post on the group's Facebook page reads: “We have seen the abuses and malpractice of this government, and governments before it.
“We have seen the encroaching destruction of many civil liberties we hold dear.
“We have seen the pushes to make the internet yet another part of the surveillance state.
"We have seen the government’s disregard for migrants, for the poor, the elderly and the Disabled.
“We have seen the capital, profit and greed of the few put before the well-being of the many and we say enough is enough…
“The government and the 1 per cent have played their hand, now it is time to play ours.”
When and where is the Million Mask March?
This year’s march is set to take place on Monday, November 5, Bonfire Night.
Police usually impose conditions on the march, and limit it to a three-hour period between 6pm and 9pm on a prescribed route between Trafalgar Square and Whitehall.
Any static protest only takes place in Trafalgar Square, Richmond Terrace and Parliament Square and the Met has previously warned that anyone breaching the conditions could be arrested for public order offences.
Roads in the St James's Park usually close early on, while other roads could be fully closed if police deem this necessary.
What can be expected of this year’s march?
In the past, police ramped up their efforts amid concerns “peaceful protest is the last thing on the minds of some of those attending".
The 2016 event erupted into anarchic scenes as fireworks and flares were lit and thrown into crowds and launched at police officers.
Scores of riot police were deployed and 53 people were arrested as furious protestors shouted of “f*** the police”.
While at last year's march, police made 25 arrests and fireworks were let off around Trafalgar Square and Downing Street.
Police say criminality at the event has increased year-on-year, with only 15 arrests in 2013.
In previous years, monuments have been criminally damaged and protestors have even tried to take over buildings, Scotland Yard said.
What is Anonymous?
Anonymous is a group of hacker-activists which aims to target establishment hypocrisy.
It originated in 2003 from the website 4chan – an online forum where users' identities are obscured by forced anonymity.
Since 2008’s Project Chanology, when the collective took on the Church of Scientology in a series of protests, pranks, and hacks, it has become increasingly associated with collaborative hacktivism on a number of issues.
Since then it has taken on a variety of targets ranging from government agencies, Isis, the Ku Klux Klan and Westboro Baptist Church to corporations such as PayPal and Sony and US President Donald Trump.
