A Secret Service agent assigned to Republican presidential nominee Mitt Romney’s security detail left a gun unattended in the bathroom of a plane carrying the candidate to Indiana on Wednesday. After a reporter found the gun in the lavatory, a Secret Service agent quickly retrieved the weapon.

The gun appeared to have been left behind accidentally while the agent was using the restroom, and Romney did not appear to be in any danger.

The chartered aircraft was carrying Romney, campaign staff and journalists from Tampa, where the Republican National Convention is being staged, and Indianapolis, where Romney addressed the American Legion. 

"We are aware of the incident. We take the care and custody of our equipment, especially our firearms, very seriously,"  Secret Service spokesman Edwin Donovan told The Washington Post. "This matter will be handled internally and in an appropriate manner."

The Romney campaign declined to comment about the incident.