A search warrant executed in Harrow turned up more than $145,000 in firearms, money, and illicit drugs.
The Ontario Provincial Police searched a home last Wednesday on Erie View Avenue.
They were joined by members of the Essex County OPP Community Street Crime Unit, OPP Urban Search and Rescue, Chemical, the Essex County Canine Unit, and Canada Border Services Agency, which aided with the use of a handheld X-ray machine.
The effort also included support from the Chemical, Biological, Radiological, Nuclear, and Explosive Response Team.
The OPP say the investigation is ongoing.
So far, police haven't said if anyone was arrested or what charges they face.