Police are investigating after a man suffered injuries which could have been caused by a gun in an incident in Lambeth Road on Thursday night.
Police were alerted at about 10.30pm after a man with neck injuries presented himself at St Thomas' Hospital.
Officers believe that the man's injuries could have been caused by a firearm.
The victim, a male in his late teens, was treated for his injuries and discharged from hospital.
A Metropolitan Police spokesman said that inquiries were continuing.