Commuters who were accused of assaulting a man who had exposed himself on a packed London Underground carriage could be arrested.
British Transport Police (BTP) said the naked man, who was detained under the Mental Health Act, was allegedly attacked on the District Line in East London.
After the man continued to refuse the requests to pull his pants up at 3.30pm last Thursday, four men appeared to intervene.
The man was subsequently pinned to the ground and carried off the train.
He was then arrested by an off-duty police officer a short time later.
However, detectives are deciding whether the men committed any criminal offences during the confrontation with the naked man.
While the BPT has appealed for witnesses to come forward, no arrests have been made over the brawl.
"The man had been assaulted by a number of other passengers and was initially arrested by an off-duty officer, before being detained under the Mental Health Act and taken to hospital," BTP said in a statement.
The naked man was confronted when he had his pants around his ankles
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The man had his back against the Tube doors as other men surrounded him
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Police said an investigation into the incident was "ongoing".
In a video posted to X, a man approaches the naked person, saying: "Yo, you need to get off the f**king train bro".
The man, who had his trousers around his ankles, yelled in response: "F**k off."
The bystander again tells the man that "you need to get off the f**king train, mate".
The man was pinned to the floor before being arrested
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He added that "there's f**king kids about".
The video then pans to several commuters appearing to watch nervously as other men join in, telling the naked man to pull up his trousers.
A bystander is then allegedly seen kicking in the direction of the naked man.
The video pans away before a group of men are seen throwing kicks and slaps as the naked man is backed against the Tube doors.
The man was pinned to the floor before being arrested
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After the video cuts off, the naked man is then seen lying on the ground with his hands behind his back.
He is then seen being dragged by his feet, carried off the train and onto the platform.
It is yet another incident on the London Underground, which comes under Sir Sadiq Khan's Transport for London.
Since Khan became Mayor in 2016, London Underground crime rates have more than doubled.
Another screengrab from the incident
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According to the Daily Mail, London's most dangerous tube and train stations found 4,100 crimes were recorded at King's Cross St Pancras alone in 2024.
It is more than any other station on the TFL network.
However, when taking passenger numbers into account, the Docklands Light Railway was top.