A gun belonging to a Secret Service agent traveling with Republican presidential hopeful Mitt Romney was mistakenly left in the restroom of the candidate's charter plane Wednesday afternoon, CBS News reports.

Romney used the charter plane to travel from the 2012 Republican National Convention in Tampa, Florida to Indianapolis, Indiana for a campaign event.

CBS News reports the weapon was found by a CBS News/National Journal reporter, who alerted a flight attendant about the gun. A member of the Secret Service who was on board the plane reportedly retrieved the gun from the restroom.

Secret Service spokesman Edwin Donovan told the AP the agency is aware of the incident and that the matter will be handled internally. No details have been released on who misplaced the weapon.

"We take the care and custody of our equipment, especially firearms, very seriously," Donovan said in a statement to CBS News/National Journal. "We will deal with this matter internally and in an appropriate manner."

Romney has had Secret Service protection since late January. His wife Ann had Secret Service agents assigned to her on August 26, just two days before her husband secured the Republican presidential nomination.

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