A man from Hartlepool has been arrested after a man broke his leg in an incident involving football supporters.
The 37-year-old is one of three to have been arrested after two groups of supporters came across each other at Earls Court station, in London.
The incident happened following the Premier League match between Chelsea and Middlesbrough on Monday, at about 10.30pm.
The supporter groups came into contact with each other a short distance from the railway station, before what British Transport Police (BTP) describe as "banter" escalated into violence.
BTP say that one of the groups confronted a man from the other group when inside the station, and a 37-year-old was punched in the face by two people, with one of the punches causing him to fall to the floor.
The man broke his leg in two places, and is recovering in hospital after having to undergo surgery.
The offenders may have been armed with a glass bottle, according to BTP.
A 60-year-old man from Essex, a 37-year-old man from Hartlepool and a 31-year-old man from Grimsby have been arrested in connection on suspicion of GBH and have been released under investigation.
Officers would like to speak to anyone who witnessed the incident or has any information about what happened.
Investigating officer PC James Hill said: “This was a nasty incident which escalated very quickly.
"What seems to have started as some friendly banter between opposing football teams soon turned violent, with one man suffering very serious consequences.
“There is likely to have been a number of people in the station who saw what happened and I am very keen to speak to them so that we can establish the full circumstances of this incident.
"Please contact me by calling 0800 40 50 40 or text 61016.”
Those who contact the aforementioned numbers are asked to quote reference number 569 8/5/17.