This week police officers, acting on a tip-off from a member of the public, retrieved a knife that had been concealed in a wall near a Bermondsey primary school.
Officers from Grange safer neighbourhoods team recovered a 4.5-inch knife which had been concealed behind a wall and wrapped in cotton wool and cellophane.
"We are always grateful when members of the public pass information to us," said PC Graham Baker.
"It is essential for the prevention of crime and protection of the community. Grange SNT continues to be dedicated to tackling youth violence, knife crime and robbery. Weapon sweeps will continue to be routinely carried out across the ward."
Southwark Police are currently running an initiative called Operation Trinity with a special focus on youth violence, knife crime and robbery.
In January Grange SNT officers seized six knives in two days.
Grange SNT can be contacted on 020 8721 2439. If you want to provide information but wish to remain anonymous call Crimestoppers on 0800 555 111.