Checked baggage operations were temporarily suspended Wednesday morning at the Birmingham-Shuttlesworth International Airport after an unexpected discovery in a passenger's luggage.

TSA spokesman Mark Howell said via Twitter that four 40mm grenade rounds were discovered in the passenger's bag. A TSA explosives specialist assessed the images and made the call to notify police bomb technicians "to ensure everyone's safety."

The grenade rounds were removed from the checked baggage and operations resumed a short time later. Howell said he did not know if these were live rounds. The FBI, he said, was called in to investigate.