One of the biggest fentanyl busts in U.S. history was announced this week, in addition to the arrests of 16 people – including a high-ranking member of the Sinaloa Cartel.

The multi-agency investigation began with undercover operations and surveillance six months ago, authorities said.

The U.S. government says it made the largest fentanyl drug bust in the nation's history, arresting 16 people, including a man living in Salem. Attorney General Pam Bondi reported roughly 11.5 kilos of fentanyl, including three million fentanyl pills, were seized in New Mexico, Arizona, and Utah.