A 24-year-old man has had his ear bitten in a row over mobile phone use on a train, British Transport Police (BTP) said.
The attacker complained that the victim’s friend was speaking loudly on his phone on board a Southern Railway service from London Bridge to Peckham Rye.
This led to an argument during which the attacker leaned over and bit the passenger’s ear.
He “eventually stopped biting the victim’s ear” and returned to his seat, a BTP spokesman said.
The man suffered a deep cut to his ear and required hospital treatment following the incident at around 11.40pm on 6 October.
Officers have released a CCTV image of a man they believe may have information that could help their investigation.
Anyone who recognises him is urged to call BTP on 0800 40 50 40 or text 61016, quoting reference number 376 - 08/10/2017.