Authorities executed a search warrant Friday on a Holmen storage locker looking for possible explosives in the wake of a December arrest, authorities said.
The episode began Dec. 29 when Tomah police stopped a vehicle driven by Anthony D. Sherwin, 35, unknown address, for a traffic violation.
During the stop, a Tomah police dog alerted officers, who searched the vehicle and found an improvised explosive device consisting of several types of explosive powder and steel shot in a glass jar.
Tomah police said Friday they determined that Sherwin had rented a storage unit in Holmen, so they obtained a search warrant for any additional explosive devices.
The search turned up no additional explosive material, although a facsimile pipe bomb was found and rendered safe.
Tomah police were assisted by bomb technicians and dogs from the FBI-Eau Claire office, Marathon-Oneida County sheriff’s office, Wisconsin State Patrol, Holmen police and Holmen area firefighters.