Police cited Horne for one count of leaving the scene of a collision/unattended vehicle, a class three misdemeanor.
The hit-and-run happened about 12:45 p.m. at 202 W. Roosevelt St. and involved property damage only, according to officers.
FBI agents allege that Horne left the scene because he was having an affair with a female employee in the car he was driving and didn't want their relationship to be reported.
An FBI report released Tuesday said agents learned during a campaign finance investigation that Horne was having an affair with the woman and that they would meet at her apartment. The parking garage for the apartment complex was the location of the crash.
The investigation was turned over to the Phoenix Police Department by the FBI on Oct. 1.
Horne said that he bumped into someone's bumper while in a downtown parking garage last March. He was driving a borrowed car. Horne said he didn't remember doing it but sent a letter about it to Maricopa County Attorney Bill Montgomery.
Horne declined to comment on whether he was having an affair but said he didn't know there was any damage to the parked vehicle.
Horne released the following statement on Tuesday:
"The FBI report states: 'Montano [the owner of the other vehicle] advised that he was unaware that his vehicle had been hit by another vehicle until FBI Agent Grehoski called him to arrange for the interview. Montano advised that the black mark on the front passenger side of the bumper came from when his son was parking the vehicle in the garage.' The incident may have caused no damage to that vehicle. At worst, pictures show nothing but some scratched paint. 'Hit-and-run' is a misleading image for, at worst, paint scratches with no dents.
If I had been aware there was damage, I would have left contact information. The parking area is the main parking area for people who have lunch at Pita Jungle and other restaurants in the immediate area. Leaving contact information for a paint scratch in that area would have been irrelevant to whether there was a passenger or not, and the FBI agent's speculations are without basis.
No one has explained why FBI Agents, investigating whether there were alleged campaign finance violations in 2010, were surveilling me in 2012."
The allegation came up during an FBI investigation into allegations that Horne had broken state campaign finance laws.
Montgomery announced several weeks ago the allegations in a planned civil enforcement action stem from the FBI investigation into $500,000 of spending by a group that was led by a Horne ally.
Horne said the allegations are completely false.
Stay with cbs5az.com and CBS 5 News for updates on this developing story.
Copyright 2012CBS 5 (Meredith Corporation). All rights reserved. The Associated Press contributed to this report.
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