The incident happened during a speech given by the French President, Francois Hollande, in the town of Villognon. The shoot was apparently fired when the officer moved position on a roof about 100m (328ft) from a tent where the French President was speaking.
The bullet injured a waiter inside inside the tent where drinks were being made, it passed through his thigh and lodged in another person’s calf.
As Hollande was inaugurating a new stretch of railway, a loud gunshot was heard. The incident briefly interrupted Hollande’s speech.
“I hope it’s nothing serious. I think not,” Hollande said as he paused his address to ask whether anyone had been hurt.
The injuries were not life threatening. According to local reports, the safety catch of the sniper’s weapon was unlocked, allowing the gun to be discharged accidentally.