A years-long investigation into drug trafficking in Madison County and Eastern Idaho culminated this week in a series of residential search warrants that netted a significant cache of illegal drugs, firearms and vehicles, authorities said.

Madison County Sheriff’s Office detectives, working alongside a coalition of local, state and federal law enforcement agencies, executed the warrants as part of an operation targeting what investigators describe as an established drug trafficking network operating throughout the region.

The haul was substantial. Law enforcement officers seized more than 1,600 THC cartridges containing over six pounds of THC, 2.8 pounds of raw marijuana, 180 grams of THC wax, 81 grams of THC edibles, 56 grams of THC honey, 79 grams of psilocybin mushrooms and six grams of heroin. Eleven firearms were also recovered along with multiple vehicles.

“This operation is a testament to the hard work and dedication of the investigators and partner agencies involved,” the Madison County Sheriff’s Office said in a news release. “By working together, we continue to disrupt the flow of illegal drugs into our communities and hold those responsible accountable. Our detectives will continue working closely with our law enforcement partners to identify, investigate and hold accountable those who bring illegal narcotics into our community.”

Authorities have not yet provided information on those arrested following the execution of the search warrants.

The Madison County Sheriff’s Office said it conducted the operation with help from a broad coalition of law enforcement including the Rexburg Police Department, Fremont County Sheriff’s Office, Idaho Falls Police Department, Bonneville County Sheriff’s Office, Idaho State Police, Homeland Security Investigations and the United States Postal Inspection Service.

The presence of both Homeland Security Investigations and the U.S. Postal Inspection Service suggests the trafficking network extended well beyond Madison County’s borders and may have involved shipments routed through the mail.