Published: Apr 04, 2012 4:47 PM EDT
Updated: Apr 04, 2012 5:00 PM EDT

FORT MYERS, Fla.- DEA agents served a routine administrative warrant at the Walgreens located on Colonial Blvd. in Fort Myers on Wednesday morning.

The store was open for business, but some customers were alarmed to see DEA agents investigating the pharmacy.

Officials say this is not a criminal investigation.