Detectives are appealing for information following a fight at Waterloo Station which left a man with a broken eye socket.
The altercation happened shortly before 9pm on Sunday 22 April on the southbound Northern line platform at Waterloo Station.
The victim, a man in his twenties, was involved in a physical altercation with another man on the Northern line platform.
The victim then fell to the floor; the other man then kicked or punched him to the face. This resulted in a broken eye socket.
Police say that it is possible this injury will require surgical correction.
Detectives have released a CCTV image of a man they believe has information that could assist the investigation.
Officers are alsokeen to speak with anyone who witnessed the altercation.
Anyone that recognise this man should contact BTP by sending a text to 61016 or by calling 0800 40 50 40 quoting reference 585 of 22/04/2018. Alternatively, contact Crimestoppers anonymously on 0800 555 111.