A section 60 was in place across large parts of Camberwell and Peckham on Saturday night after a stabbing in Walworth.
The victim, aged 20, was found in Sutherland Square with a single stab wound to his armpit just before 9.30pm on November 28.
It is believed he was attacked near the junction with Sutherland Walk and Walworth Road.
After being hospitalised his injuries were confirmed as being neither life-threatening nor life-changing.
Inspector Simon Blondell said a Section 60, and extra patrols from the Met’s Territorial Support Group, were in response to ‘suspected ongoing tensions’ from this attack.
The Section 60 covered parts of Southwark north of the A202: Camberwell New Road, Peckham Road, Peckham High Street and Queens Road. It was in place until 7am on Sunday 29, November.
No arrests have been made at this stage and, so far, no information about any suspects has been released.
Anyone with information should call 101 or contact Crimestoppers.