COLUMBUS, Ohio (WTVN) -- Another loaded firearm was found in baggage at Port Columbus. It's the 12th time this year that agents from the Transportation Security Administration have found a loaded gun.

TSA agents discovered the loaded 9mm Beretta at 6:30 a.m. Sunday in a carry-on bag. Agents alerted airport police who took possession of the bag.

While firearms may be transported in checked baggage, provided they are declared to the airline and in a proper carrying case and unloaded, they are prohibited in carry-on bags. 

“Passengers are responsible for the contents of bags they bring to the checkpoint,” said Mark Howell, TSA spokesman. “Our advice is to look through bags thoroughly before coming to the airport to make sure there are no illegal or prohibited items.”

A total of ten firearms were found at Port Columbus checkpoints in 2013.

In addition to potential criminal charges, passengers who bring firearms to a checkpoint face civil penalties from TSA. 

(Photo courtesy TSA)