OSCEOLA COUNTY, Fla. — Twenty-six people have been arrested as part of a three-month fentanyl operation in Osceola and Orange counties that Osceola County Sheriff Marcos Lopez said Wednesday was the largest ever in his county.

According to Lopez, 1.3 kilograms of fentanyl was seized as part of the investigation, which also included the U.S. Drug Enforcement Agency, Florida Highway Patrol, Orange County Sheriff's Office and the Office of Statewide Prosecution..

The investigation was named Operation My Brother's Keeper because it originally started with small purchases involving two brothers. Lopez said the purchases got progressively larger until investigators believed the operation did not involve "small-time drug dealers." Law enforcement is continuing to investigate to try to determine whether all those involved have been apprehended, he said.

At Wednesday's news conference announcing the bust, the Sheriff's Office displayed photographs and the names of only 23 of those arrested. The specific charges each person faces were not announced.

Lopez only said they face "drug charges" and that if convicted, all those arrested would face a minimum of seven-year in prison, and up to 25-years.

As part of the investigation, law enforcement also seized 1 kg of cocaine, 53 grams of cannabis, nine firearms, about $73,000 in cash and a house that Lopez said investigators believe was purchased with drug money and used for trafficking.