After a four-month investigation, the Erie County Sheriff’s Office says this week’s operation led to one of the largest meth seizures in its history.

BUFFALO, N.Y. — The Erie County Sheriff’s Office on Thursday said a four-month investigation led to a major drug bust, and one of the largest meth seizures in its history.

Deputies — along with local, state, and federal partners — executed search warrants in Buffalo and Lockport earlier this week. Investigators said they found nearly 42 pounds of suspected crystal meth, along with 11 pounds of fentanyl, five pounds of suspected cocaine, a stolen shotgun, and cash.

Officers arrested 55-year-old Michael Hatten of Buffalo, who was released on bail but is now back in custody, after U.S. Marshals picked him up on a federal warrant during a traffic stop on Monday.

“It is believed to be the largest single seizure of meth in Erie County Sheriff’s Office history,” the sheriff’s office said in a statement Thursday.