The is the dramatic moment a police officer pepper sprays a rail passenger after he resists arrest for refusing to wear a face mask on a train.
The shocking footage shows the clash between the passenger and the lone officer on a Wirral line service at Lime Street Station in Liverpool.
The video shows the officer telling the man to wear a mask, only for the man to counter, saying he does not have to wear a mask as he has a 'medical condition'.
Passengers on public transport in England are required by law, or face a fine, unless they have a medical condition which prevents them from wearing a mask.
The officer continues to insist the man wear a mask or leave the train, but the man refuses.
In the footage, which has already been viewed one million times online, the man shakes his head and says: 'You're not allowed to touch me by law. I do not have to wear a mask, end of, and you do not have to challenge me. It's against the law to challenge me.'
The shocking footage shows the clash between the passenger and the lone officer on a Wirral line service at Lime Street Station in Liverpool
As the officer takes hold of the passenger's arm, the man resists fiercely and shouts: 'Yo, who the f*** do you think you're grabbing?'
In both England and Scotland face coverings are mandatory on all public transport, including buses, coaches, trams, ferries, aircraft and trains.
In addition, some operators will amend their conditions of carriage, allowing them to enforce the requirement in a similar way to the rules on having a ticket for travel, meaning they can implement the changes in the way that works best for them.
Under the rules, operators are able to stop passengers who refuse to follow the rules from travelling and direct them to leave services.
In England, the police and Transport for London authorised personnel are also be able to issue fixed penalty notices of £100, or £50 if paid in 14 days.
There are a number of exemptions, such as on medical grounds, as well as for young children.
The officer gives the man his final warning before telling him: 'You're getting off.'
He takes hold of the passenger's arm, the man resists fiercely and shouts: 'Yo, who the f*** do you think you're grabbing?'
The officer tries to remove him by force but the man refuses to budge and blasts: 'I've told you no. Now get off me.' To which the officer replies: 'Off the train, or I'll get you locked up.'
He wrestles with the officer - who threatens to pepper spray him - as fellow passengers protest: 'He's done nothing wrong. Medical condition.'
The officer then attempts to spray the unruly passenger - who desperately shields his face - but is unable to get a clear shot and urgently calls for backup on his radio.
The passenger continues to resist arrest and shoves the officer back, shouting: 'I've already told you why I don't have to f****** wear one. Now f*** off.'
As more officers rush to help, the man's friends accuse the officer of abusing his power and call him a 'bully'.
Undeterred, he manages to cuff one of the suspect's wrists and pepper sprays him.
In the ensuing