A man was stabbed in Herne Hill’s Brockwell park on Wednesday night.
Police are appealing for any information or witnesses to come forward after the victim was found in Effra Parade at 8.17pm on June 2.
The 20-year-old had been knifed in the leg. He has now been discharged from hospital.
Officers believe the stabbing took place in Brockwell Park, a short distance away from where the man was found.
Police believe he was attacked in the nearby park and are trying to identify a man who was seen in the area earlier in the evening.
He is described as black, around 5ft11, with a large build, wearing a grey tracksuit and white top with grey writing.
Detective Constable Kismet Green, who is leading the investigation, said: “We are keen to speak to anyone who was in the Brockwell Park area on Wednesday evening at around 20:00hrs.
“The park was busy because of the warm weather and we believe there will be people who witnessed the incident or noticed some sort of altercation.
“We would encourage anyone who knows anything, no matter how small, to get in touch.”
Anyone with information should call 101 or, to remain anonymous, contact Crimestoppers.