A shotgun has been found in some bushes in a street in Wellingborough.
A member of the public called police at about 11.50am on Sunday after finding the weapon, which was taken away for forensic analysis.
Police would like to speak to anyone who may have seen people acting suspiciously in the Hemmingwell area of Wellingborough, or who may have any information about the gun.
The discovery follows police raids on the estate last Wednesday, when officers entered more than a dozen houses after reports of armed drug-dealing gangs.
Police found a gun hidden under a hedge at one of the properties they raided, but say yesterday’s discovery is unrelated.
Witnesses or anyone with information is asked to call police on 101 or Crimestoppers anonymously on 0800 555 111.