WICHITA, Kan. (KSNW) — Officers with the Wichita Police Department (WPD), through an ongoing investigation, have recorded what they believe to be the largest seizure of fentanyl nationwide.

A Facebook post by WPD says that within the last 10 days, their NIIBIN (National Integrated Ballistic Information Network) Enforcement Team has seized “close to ten crime guns and a massive number of suspected fentanyl pills.”

WPD estimates, based on weight, the number of pills to be between “half a million to a million.” This would make the seizure the largest of fentanyl for the WPD to date and a record seizure nationwide, according to the post.

Because of the sensitive nature of the investigation, no further details are being released.