POLICE are hunting for the man who stabbed a teenager five times on a tram in the early hours of Monday morning.
The man approached a number of passengers and lunged at three young men, stabbing a 15-year-old boy five times with a knife, puncturing his lung.
The incident happened as the tram approached West Croydon at 12.40am on Monday morning, a British Transport Police (BTP) spokesman said.
The man then got off the tram at West Croydon. It is thought he boarded at Mitcham.
Detective Constable Marie Jeffery said: "I must find who was responsible for this serious assault.
"I have issued these two CCTV images in the hope someone recognises this man, or saw what happened. I believe he can help us with the investigation. If you know the man, or were on the tram at the time of the assault, please contact BTP."
Anyone with information is asked to contact British Transport Police on 0800 40 50 40, or by text, to 61016, quoting reference B8/SSUB of 29 September 2014. Information can also be passed anonymously to Crimestoppers, on 0800 555 111.