A man was stabbed four times during a failed attempt to rob him of his mobile phone in Marcia Road earlier this month. Police have released an image of a man they wish to trace.
A knife was held to his throat and the suspect demanded that he hand over his mobile phone.
The victim initially managed to escape but fell while running. The suspect caught up with him and stabbed him four times before fleeing without the mobile phone.
The victim's injuries were not life threatening and he has since been discharged from hospital.
Detective Constable Samuel Cafferty from Southwark CID said: "It was fortunate that the victim in this case did not sustain more serious injuries.
"The level of violence used against him was shocking when weighed against the suspect's aim of stealing a mobile phone.
"I am very keen to hear from anyone who can name this person.
"Although the image is not particularly clear, I am convinced that anyone who knows him would recognise him from the image and I urge them to contact me immediately."
The man pictured is believed to be a black male, aged 20-25, with a goatee beard and what is described as a south London accent.
He was wearing a black 'puffa' style jacket with hood, baseball cap, light-coloured jeans and trainers.
The CCTV still shows the suspect walking along the southern part of Dunton Road following the attack.
Anyone with information should contact Southwark CID by calling 020 7232 6120 or 101 or Crimestoppers anonymously on 0800 555 111.