Police have launched a search after a man attacked another with a bottle on a Piccadilly line train in an unprovoked attack.
The victim had boarded the eastbound train from South Ealing station at around 2pm on Friday January 9 when the attack occurred.
Before alighting at Hammersmith Underground station, he was approached by another man.
The man offered him a drink of alcohol, which the victim refused.
According to British Transport Police, the other man then became aggressive and abusive.
The incident occurred on January 9BTPHe hit the victim on the head with a wine bottle, causing it to shatter and leaving deep cuts.
The victim was left needing emergency treatment in hospital.
Police have now released images of a man they think could have information which would assist their investigation.
The man pictured is wearing a black gilet, a black beanie hat and white trainers.
Anyone who recognises him is asked to text BTP on 61016, or call 0800 40 50 40, quoting reference 295 of 9 January.
Information can be given anonymously to Crimestoppers on 0800 555 111.