Tommy Robinson has been arrested by British Transport Police (BTP) at Luton Airport after flying back from Faro.
Last week BTP made “arrest enquiries” and appealed to the public after Robinson was seen standing close to an unconscious man at St Pancras International Station.
The unconscious man was seen lying face down on the floor and was given CPR at the scene by paramedics and taken to hospital.
Robinson whose real name is Stephen Yaxley-Lennon was seen with a cut on his head and claimed he had a fight with a door.
Robinson left the UK shortly after the incident.
In a statement British Transport Police said, “Officers from BTP have tonight (4 August) arrested a 42-year-old man from Bedfordshire in connection to an assault at St Pancras station on 28 July.
“The arrest took place at Luton Airport shortly after 6.30pm, following a notification that the man had boarded an incoming flight from Faro.
“The man had been wanted for questioning after leaving the country to Tenerife in the early hours of 29 August following the incident at St Pancras.
“He was arrested on suspicion of GBH (Grievous Bodily Harm) and will now be taken to custody for questioning.”