ATLANTA -- Atlanta police are investigating after a Delta Air Lines employee found a disassembled shotgun in a break room at Hartsfield-Jackson Atlanta International Airport.

Police said the employee was looking for his iPod Sunday night when found the shotgun under a soda machine.

The employee told his supervisor, who notified police.

A police report said that a more thorough search of the break room turned up a container of gun lubricant and "tools for disassembly."

An Atlanta police officer did a background check on the weapon but could not immediately determine who owned it.

Airport spokesman John Kennedy said he couldn't comment on the case because it is an ongoing investigation.

The incident comes a month after a judge upheld a ban on guns at the airport.

A gun rights group had sued the city and Hartsfield-Jackson Atlanta International Airport over the ban, claiming a new state law allowed people with concealed weapons permits to carry guns in certain areas of the airport.