A witness has revealed what happened after footage emerged of Tommy Robinson next to an unconscious man at St Pancras International Station.
The political activist was filmed shouting "you saw him, he came at me" as a man appeared to lay unresponsive and bleeding on the floor of a walkway towards the station’s Thameslink hub.
Robinson — whose real name is Stephen Yaxley-Lennon —left the UK on a flight on Tuesday morning following the incident on Monday evenng.
A fellow passenger claimed they saw Robinson, 42, arguing with an older gentleman before punching him so hard it knocked him out.
They said Robinson allegedly shouted at him to "come at me then" before he "punched the man so hard he was knocked out".
The witness had been on the way to catch a train when he "heard a loud commotion and arguing" at the top of the Platform B escalator.
He said that as he approached the top, he saw the pair "facing off and standing very close to each other".
The witness told MailOnline that the alleged assault seemed "very serious" as the individual "wasn't moving afterwards".
Robinson could then be seen leaving down a staircase, while another man can be heard saying "quick, can we get someone here" to staff.
He then comes back up the stairs and appears to tell the man "he come at me bruv, you saw that".
Since the clip emerged, Robinson reposted a post on X, formerly known as Twitter, from a user which read: "If you approach someone with hostility, a man that receives death threats daily, expect to get a clip round the ear hole."
The British Transport Police said that a man was taken to hospital with "serious injuries", although they were not believed to be life-threatening.
A spokesman for the force said on Tuesday: "BTP were called to St Pancras station just after 8.40pm yesterday (July 28) following reports of an assault.
"Officers attended and a man was taken to hospital with serious injuries, which are not thought to be life threatening.
"Overnight the investigation has been ongoing and officers have been making arrest enquiries.
"Officers have confirmed that the suspect, a 42-year-old man from Bedfordshire, boarded a flight out of the country in the early hours of this morning.
"Detectives are continuing to work closely to progress the investigation and bring him into custody for questioning."
