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A man was knocked out during an argument over face masks at Clapham Junction station.
Police are investigating after the victim, who asked the Press Association news agency to only identify him as 'William', was punched by a fellow passenger at the London railway stop.
The victim was sent to hospital where he was treated for a severe laceration and given stitches for a head wound following the scuffle.
Along with a friend, William, not his real name, had been arguing with South Western Railway staff by the ticket barrier because one member was not wearing a mask.
Footage taken by the friend shows a male in a grey hoodie pushing a pram past the heated exchange. He had a child with him and was also not wearing a mask.