The 42-year-old far-right activist was arrested at Luton Airport on August 4 in connection with the incident, which took place on 28 July.
British Transport Police said the alleged victim “did not wish to provide a statement to the investigation”.
“Following a report of an assault at St Pancras station on July 28, detectives from BTP quickly launched a full and thorough investigation, which involved a 42-year-old man being arrested on suspicion of GBH at Luton Airport on 4 August,” British Transport Police said.
“Officers worked at pace to gather evidence, including CCTV footage and witness statements, however the victim did not wish to provide a statement to the investigation
“We presented the prosecution file to the Crown Prosecution Service (CPS) – who are responsible for considering the evidence available and deciding whether it meets the legal threshold to charge someone with an offence.
“Following a review of the available evidence, the CPS concluded that there was not a realistic prospect of conviction and therefore there would be no criminal charges in this case.”
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