A shopper was chased down the street by a woman who accused him of trying to film up her skirt before he was tackled by a 100-strong mob in an extraordinary Oxford Street row caught on camera.

The 'chaos' in central London on Sunday night was sparked when the alleged victim started screaming: 'F***ing pervert. He has a video between my legs'.

She claims he put his shopping bag between her legs and used a mobile phone placed in the top to take a voyeuristic up-skirt film of her knickers and crotch.

The incident was caught on camera by a passing cyclist who saw the woman running down Oxford Street in tears. Within seconds a group surrounded the man she was chasing.

The detained man shouts 'let go of me' as he is pulled to the pavement and his accuser repeatedly kicks him before being dragged away by a man telling her: 'Don't do that, that's assault'.

The police arrived at 7.22pm and arrested him only to change their minds and de-arrested him 14 minutes later after finding no footage on his phone and his accuser had not stayed to give a statement.

Mob: This is the moment a woman started kicking a man she accused of filming up her skirt on Oxford Street on Sunday

Surrounded: A policeman picks up the accused off the pavement after up to 100 people surrounded him after accusing him of voyeurism

Held: Police let him go just 14 minutes later after finding he had nothing on his phone - pictured is an officer looking at the device. The alleged victim had gone without speaking to them

The cyclist who witnessed the row said up to 100 people surrounded the man during Sunday night's citizens' arrest.

Irate: The alleged victim swears repeatedly in the film and calls the accused a 'f***ing pervert'

He said: 'I've never seen anything like it. The way everyone surrounded this guy, it was like a mob.

'The woman was screaming the place down.

'As they got closer to me, a young man then stepped him to stop him getting away. They were headed in my direction and I restrained him too as the lady clearly was crying and very, very upset.

'At first I thought it was an argument, then maybe I thought someone was stealing her bag or something. But she was yelling, saying the man had tried to film up her skirt. I realised it was quite serious.

'I almost fell off my bike. Then others stepped in and I was concerned a scuffle might break out. The police were sought to come and make an arrest, which we were happy about.

'The man was questioned and his mobile phone was looked it. There was a young woman who said she saw the whole thing, but the victim herself had disappeared.

'Perhaps she was worried because she had kicked out at him on the floor. There must have been a crowd of more than 100 people. It was chaos'.

Spark: A passing cyclist was on his way home from work when he spotted at commotion on the pavement next to the 55 bus

Held: The suspect (pictured with the red bag on his back) was grabbed by a member of the public as the woman screamed she had been the victim of a crime

Violence: The clearly very upset woman starts kicking the man she accused as he sat on the ground

Warning: She was then dragged away and warned that she could be arrested for assault

In the footage, the woman drags the man to the ground with the help of passers-by but then lashes out at him as he sits on the pavement near Oxford Circus Tube station.

The alleged voyeur is later handcuffed by police while a witness explains what she claims to have seen - but the victim flees the scene.

At one point the woman accusing the man of voyeurism screams 'f*****g pervert' at him as she sobs, but eventually disappears amid the commotion.

Dozens of onlookers came to a standstill as three police officers eventually surrounded the man to look at his phone, search his pockets, and study his ID.

One woman, who claimed to have witnessed the episode, can be heard telling a police officer: 'I was standing behind him and my boyfriend was like "what's he doing?".

'Because they were looking at the show and she was standing in front and she just started going like this... and then he was holding his bag.

'In his bag was his phone, upside down, under her skirt. And she goes... and then she sees his phone. And then she goes "what are you doing? and then he runs away.

'So that's what I saw, and then he starts acting all guilty and runs away, so...'

The cyclist, who asked not to be named, said the altercation happened just after 6pm on Sunday as he made his way home from work.

He said: 'The arrested man was very lucky indeed he was not beaten up.'

Scotland Yard has said the man was de-arrested after officers failed to find any incriminating evidence on his phone and the alleged victim was not there to give a statement.

A spokesman said: 'At around 6.10pm on Sunday, April 9, police in Oxford Street were alerted to an altercation near Oxford Circus Tube station.

'Officers attended and found a man being detained by several members of public. A 36-year-old man was arrested at 7.22pm on suspicion of voyeurism.

'Officers searched the man and seized his mobile phone. He was de-arrested at 7.36pm following further enquiries.'