Police seized a firearm and a number of knives after a weapons sweep in Brixton and the Kennings Way estate.
Officers from Lambeth’s Safer Neighbourhoods Team carried out the search on Tuesday July 21.
They discovered a bag hidden between two walls which contained a firearm and a bullet.
Officers also found two hidden knives after further searches in Brixton.
Inspector Neil Cochlin from Lambeth North Safer Neighbourhoods Team said: “Officers carry out weapon sweeps routinely.
“This successful tactic has led to the removal of a gun and knives off the street. We will continue to work to make Lambeth as safe as possible for residents and visitors.”
If anyone has any information they are asked to call 101 or to remain anonymous call Crimestoppers on 0800 555 111 or via crimestoppers-uk.org