Extra patrols are being carried out in Norwood Green after a spate of shed burglaries.
Officers say the culprits seem to be targeting high value bicycles.
The Lower Valley neighbourhood policing tram have been patrolling into the early hours in an effort to find the thieves.
Anyone with information that might help police should call them via 101 or Crimestoppers on 0800 555111.
The team have also handed out 300 crime prevention advice leaflets after a slight increase in crime in Bailiff Bridge.