The Conneaut Police Department seized 25 firearms in the 300 block of Furnace Road Thursday.
The CPD was assisted by the Ashtabula Police Department and the Ashtabula Regional SWAT Team, according to a release from the APD.
The release said various narcotics were seized in the operation.
According to the release, the CPD served a high-risk search warrant after a months-long investigation.
Ashtabula Police Department Chief Robert Stell said the APD was called in toward the end of the investigation to assist, because the investigation had revealed there could be weapons on the scene.
Conneaut Police Department Acting Chief Mike Bertolasio could not be reached for comment.