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Thousands of protesters wearing sinister Guy Fawkes masks brought chaos to the streets of London last night.

Hundreds of anarchists were held back by police outside Buckingham Palace. They aimed fireworks at the police horses and also tried to dazzle them with laser pointers.

Another group targeted the UK premiere of the new Hunger Games film in Leicester Square, moments after Hollywood stars including Jennifer Lawrence and Julianne Moore had walked the red carpet.

Meanwhile, one anarchist was filmed smashing up a flaming police car - while wearing a Colmar ski jacket that cost around £475.

Elsewhere, officers were forced to brandish their batons after clashes turned violent as the vandals marauded through the streets, setting off smoke bombs and daubing graffiti. A total of 50 people have been arrested and at least three officers have been taken to hospital with injuries.

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A police car was set on fire by an anti-capitalist demonstrator, who was wearing a Colmar ski jacket that cost hundreds of pounds

The protestor clad in his expensive jacket, similar versions of which retail for between £100 and £500, could be seen attacking the police car's windscreen with a metal frame

A man is detained by two police officers on Regent Street in London during the Million Mask March bonfire night protest

One protester is seen appearing to attempt to strike police officers with a long piece of wood (left). He was then reprimanded (right)

A masked protester carries a smoke bomb above the crowd as the march makes its way from Trafalgar Square towards Whitehall

Anti-capitalist protestors reach Buckingham Palace during the Million Mask march, where mounted police officers were targeted

Police officers were forced brandish their batons as clashes with protesters on Great George Street, Westminster, turned violent

A protester with his face covered swears at the camera as another man fuels the flames burning on the windshield of a police car

Mounted police officers struggled to control their horses as protesters launched fireworks at the animals and shone lasers in their eyes

Demonstrators used lasers to spook mounted police officers who were on hand to keep the peace outside Buckingham Palace

A demonstrator lobs a traffic cone at mounted officers who formed a line outside Buckingham Palace, where protesters gathered

It came hours after Anonymous, the anarchist hacking group behind the 'Million Mask March' warned 'police are not your friends'. Russell Brand and Vivienne Westwood had joined the group’s supporters on a November 5 protest last year that saw spectacular clashes with police.

Earlier, three men carrying knives, gas canisters and lock picks were arrested in Trafalgar Square after a police stop and search. Police had held three people at about 2.30pm after spotting a group of men acting suspiciously.

Strict restrictions were placed on the protesters, who had agreed to march from Trafalgar Square to Whitehall. But violence erupted as crowds broke away from the main collective, gathering outside Buckingham Palace and Leicester Square.

Officers began to make more arrests after the protest’s 9pm deadline expired. It went on for at least an hour and a half longer with the final few protesters returned to Nelson’s Column shortly after 9.30pm, as some launched fireworks across Trafalgar Square.

The Metropolitan Police said at least 50 arrests were made, mainly for public order offences with two for assaulting a police officer. Police said they may arrest dozens more once they have finished watching footage of the event.

Four police officers were being treated in hospital this morning, including one whose wrist was broken when he was thrown from a horse named Embassy, which was spooked by a firework.

Sir Bernard Hogan-Howe, Metropolitan Police Commissioner, branded those that had thrown fireworks and missiles at officers and their horses 'despicable'.

He added that some protesters had asked others to stop targeting the animals, but denied that the attacks at the 1,000+ strong march were down to the actions of a small minority.

A police officer extinguishes flames after a police car was set ablaze by anti-capitalist protester during last night's demo

A protester carrying a real pigs head joins the march, in reference to the alleged drunken antics at the centre of the 'PigGate' scandal

A protester comes out with a bloodied head as crowds surge forward on Great George Street in central London

A man struggles as he is detained by police officers in central London after violent clashes erupted during the demonstrations

THUGS ON THE MILLION MASK MARCH 'PUNCHED AND ABUSED FEMALE STUDENT, 20, AS SHE TRIED TO PROTECT A HORSE BLINDED BY FIREWORKS A student was punched and abused as she tried to protect a runaway police horse during violent protests at the Million Mask March. Daisy Greenaway pulled a masked man away from a horse which had thrown its rider after being spooked by baying demonstrators during the violence outside of Buckingham Palace. Hundreds of anarchists were held back by police as they aimed fireworks at the police horses and also tried to dazzle them with laser pointers. Student Daisy Greenaway was punched and verbally assaulted when she tried to protect a runaway police horse during the violent protests at the Million Mask March in London The University of Westminister student had attended the rally to show her support for the anti-austerity campaign, which she said was initially peaceful. The 20-year-old, from Harrow, London, had followed the group along The Mall after joining around 3,000 placard-waving activists in Trafalgar Square from 6pm. Miss Greenaway told MailOnline: 'At Buckingham Palace it really took off. On arrival a horse ran past shortly by, who I assume, was the officer previously on him. 'People threw fireworks. When I told people not to hurt horses I was told "police horses don't feel" and that "they're trained for this stuff". 'I pulled one guy away from the horse who tried to fight me. After this I held away from the crowds but witnessed rioters throwing bins, glass and traffic cones.' Following the attack Miss Greenaway posted a message on her Twitter account Miss Greenaway took to Twitter to tell of her shock following the attack, claiming she received sexist abuse. An officer told the Evening Standard that the horse had been blinded after a masked protesters shot a firework into its face. Horse Embassy - one of the force's oldest horses - was startled and bolted after being targeted with a firework. The 16.2 hands high horse sustained injuries to his side, fetlock and front leg. The rider was taken to hospital suffering from a broken wrist. Metropolitan Police Commissioner Sir Bernard Hogan-Howe pets police horse Embassy who was targeted by a firework during the protests Today Metropolitan Police Commissioner Sir Bernard Hogan-Howe branded those that had thrown fireworks and missiles at officers and their horses 'despicable', as he visited the injured horses at Great Scotland Yard. He added that some protesters had asked others to stop targeting the animals, but denied that the attacks at the 1,000+ strong march were down to the actions of a small minority. Sir Bernard said: 'He slipped and in slipping obviously trapped the rider. 'And it could have turned out far worse - if you get a horse on top of you, you could die.' The officer was now recovering at home. The Commissioner said he believed the animals had been deliberately attacked and that protesters knew there was a possibility fireworks would frighten the animals. He said: 'They have no right to hurt other people, they have no right to hurt animals, and they have no right to frighten the members of public that are wandering around. 'Protest by all means but don't hurt other people in the process.' Embassy - one of the force's oldest horses - sustained injuries to his side, fetlock and front leg Police are pictured on horses outside Buckingham Palace in London during the bonfire night protest as a firework is let off close by Advertisement

The burnt out shell of the police car that was set alight by protesters during the march before being smashed with a metal railing

Smoke bombs and flares were set off above the crowds as thousands marched through central London on the Million Mask March

Thousands of protesters rampaged through London, launched missiles at police who formed a barricade as they controlled the crowd

A campaigner with a placard reading, 'one solution: revolution', stood next to the burning police car as he took part in the demonstrations

Six police horses were injured during clashes in the Mall, Great George Street, Parliament Square and Trafalgar Square.

Pc Claire Rees said her horse Quixote, who suffered injuries to his front legs in the Mall, was 'very brave'.

She said: 'I just think it is a very cowardly thing to do. Horses should never be targeted. It was very intimidating.

'When it's a horse and fireworks are thrown, it is a very dangerous situation. Just one of our officers got injured. It could have been a lot worse, but the horses were just so amazing last night.'

She added that some protesters 'did not like the fact that the horses were there' and were concerned for their safety.

Quixote, who has recently completed his police training, was also injured a few weeks ago when he was attacked by a dog in Greenwich Park.

A member of the public wrestled the dog away from the seven-year-old horse's breast.

During last night's violence a line of police dog-handlers guarded the entrance to the BBC as some protesters ran up Regent Street, trapping staff and customers in designer stores as they launched fireworks indiscriminately. Other activists ended up in Mayfair, where windows were smashed and bins upturned.

Demonstrators also ended up in Mayfair's Conduit Street, where windows were smashed. Staff and customers also became trapped inside a designer shop off Regent Street as the protest raged outside.

Video footage taken tonight shows a protester, his face covered, smashing up a flaming police car near Green Park, in central London. Moments later, another activist climbs on top of the car and starts jumping up and down before being pulled away by a bystander.

It is understood the anti-capitalist protester was wearing a jacket worth hundreds of pounds as he carried out his campaign of destruction. The jacket, believed to be from brand Colmar, where padded jackets start at £260. He is believed to be wearing one that costs £475.

A group of men added fuel to the fire as a police vehicle burned on a road near Green Park, central London, after violence erupted

Vandals marauded through the streets, setting off smoke bombs and daubing graffiti. Above, one protester climbs on top of the police car

Other clips posted online by James Cropper showed crowds of people marching through central London before some are apparently kettled by police.

There was a surge of activity around half an hour into the march, as protesters ran towards the Churchill War Rooms near Great George Street, a short distance from Conservative Party headquarters, which were closed off.

Bottles were launched over the barriers towards officers, which was met with cheers and chants of 'Shame on you, we're human too.' A line of police and mounted officers formed a barrier against the densely packed protesters. Those who could get their arms above their waist held phones aloft.

Self-proclaimed anarchist Aztecarna Peatonito, from Mexico, said he wanted to fight inequality. ‘We tried for six years to get the Press to take us seriously,’ he said. ‘It is only when we wore the masks that we started getting attention.’

One activist, who gave her name as Lola, said she had travelled from Hull.

‘There are people who aren’t represented, they should be here. I am the people,’ she said. ‘The media twist it. We are peaceful, we are doing this in a peaceful manner, but the media focus on the one per cent who cause trouble.’

Another, who gave his name as Shero, said: ‘As an English Muslim, I feel I am not represented. We live in a corp-ocracy, not a democracy. We need to change that.’

Bottles were launched over the barriers towards officers, which was met with cheers and chants of 'Shame on you, we're human too'

Police officers formed a barricade as they tried to block masked demonstrators marching through London during the Million Mask March

Demonstrations: Campaigners wearing sinister Guy Fawkes masks - made famous in the film V for Vendetta - gathered in Trafalgar Square

Defiant: Anonymous, the anarchist hacking group behind the event, told those taking part, 'police are not your friends'

Protest: The demonstration, known as the Million Mask March, was one of dozens organised at the same time in cities around the world

The Metropolitan Police tweeted that arrests were being made for a number of public order offences after the protests turned violence

Some activists screamed ‘Whose streets? Our streets’ as confused tourists looked on and took pictures. Others carried placards bearing the message: ‘One solution: Revolution.’

Terry Small, 20, from Plymouth, emerged from a crowd with blood pouring from his head. He alleged he had been hit a number of times by an officer with a baton.

Ahead of the march, the Metropolitan Police said they had 'strong reason to believe' that peaceful protest is the 'last thing on the minds of many of the people who will come along'. Last year, 10 people were arrested over vandalism to public buildings and violence towards police officers.

Met commander BJ Harrington said: 'We facilitate hundreds of protests every year in London peacefully and with the co-operation of the organisers. On this occasion a group of protesters chose not to engage with police or adhere to the conditions of the protest and were intent on criminality.

'I’d like to thank those who conducted themselves in a peaceful manner and as well as Londoners for their patience and tolerance whilst anti-social and intimidating behaviour was happening.

'Officers have been hospitalised, a police horse suffered injuries and a police car was criminally damaged during the course of the protest which is completely unacceptable. I praise the professionalism and restraint that officers have shown in the face of hostile provocation and enabled the policing operation to pass without major incidents.

'We will bring those responsible for the criminality to face justice.'

The Metropolitan Police said they had 'strong reason to believe that peaceful protest is the last thing on the minds of many of the people

Brandishing flags and placards, protesters met in Trafalgar Square ahead of the march through central London towards Whitehall

Police reiterated that they were able to remove masks where they thought there would be criminal offences

The restrictions were imposed through the Public Order Act 1986. Police reiterated that they were able to remove masks where they thought there would be criminal offences.

A Facebook page for the event, run by Million Mask March London, said: 'The police are not your friends, this goes for police liaison officers too, they're simply a 'friendly face' who collect intelligence.'

More than 20,000 people said on Facebook that they would attend the event, which was described by its website as the 'World's Largest Protest by the Most Influential Group in the World'.

A Twitter account which appeared to be affiliated to the Facebook page for Million Mask March tweeted to the Metropolitan Police: 'We Are coming in peace ! Please remember this fact ! We Are A Peaceful Collective ! See yal tomora.'

The march meant a second day of trouble for police, after 12 people were arrested when a protest held by students calling for free education descended into violence. Most of the demonstrators were peaceful but a number turned violent as the march passed Government buildings.

Dozens of protesters dressed in military fatigues joined the demonstration in central London with signs reading, 'No more cuts'

Tight restrictions were imposed on the central London demonstrations, pictured, through the Public Order Act 1986

More than 20,000 people have said on Facebook that they would attend the event, which started in Trafalgar Square at 6pm yesterday

The protest, pictured, is described by its website as the 'World's Largest Protest by the Most Influential Group in the World'

Guess he's one of the 1% then? Shocking moment driver in a £120,000 Aston Martin mows down a photographer and leaves him lying in the street

An Aston Martin driver making his way through central London as violence broke out during last night's Million Mask March appeared to hit a photographer and leave him lying in the street.

The unknown driver had taken his white sports car for a spin through Victoria as thousands of anarchists took to the streets for the anti-austerity demonstration.

He then found himself held up by the march, as protesters spotted the luxury vehicle and turned on the driver.

But as the driver attempted to make his way past demonstrators, he appeared to clip a photographer taking pictures of the skirmish before accelerating away.

This is the moment a driver in a £120,000 Aston Martin hits a photographer taking pictures of the Million Mask March and leaves him lying in the street

The photographer can be seen collapsing to the ground as the sports car drives past him

The photographer was left lying in the road as the car accelerated away from the scene

Other demonstrators and two police officers rushed to help the photographer as he lay in the street

The photographer had been taking pictures of the car as it drove down Lower Grosvenor Place near Victoria last night

The photographer was left lying in the street, where protesters and two police officers came to his aid.

He had been taking pictures of the car as it made its way through the crowds, with demonstrators hurling abuse at the driver.

One protester whose face was hidden by a Guy Fawkes mask attempted to sit on the bonnet of the car, which appears to be an Aston Martin Rapide model - the only four door Aston Martin in production.

The Aston Martin driver had been making his way through central London as violence broke out during last night's Million Mask March

The unknown driver had taken his white sports car for a spin through Westminster as thousands of anarchists took to the streets for the anti-austerity demonstration

One protester whose face was hidden by a Guy Fawkes mask attempted to sit on the bonnet of the car

A protestor holding a placard walked slowly in front of the vehicle, preventing the driver from making a getaway

A woman holding a placard walked slowly in front of the vehicle, preventing the driver from making a getaway.

And another young woman wearing a pink scarf could be seen shaking her fist at the car as she yelled at the driver, who was then able to accelerate away from the demo, apparently knocking down the photographer.

The car did not appear to have been damaged.

A young woman wearing a pink scarf could be seen shaking her fist at the car as she yelled at the driver

The driver was able to clear the lines of protesters and accelerate away from the demo

The car, seen just before the photographer was hit, appeared to be an Aston Martin Rapide model. The identity of the driver is unknown