WATCH: Russian war games helicopter fires on civilian cars
A military helicopter on a training exercise in western Russia mistakenly fired rockets at a group of parked vehicles, knocking at least one person to the ground, footage showed.
A man in civilian clothes who had been standing close to a vehicle was engulfed in a cloud of dust.
The person filming the clip, who was slightly further away, could be seen sprawled on the ground.
Independent news site Fontanka.ru said one of the people was left with concussion but did not give details on the source of the video.
Russia is currently staging the Zapad 2017 war games in the area.
A Russian defence ministry statement on Interfax said a helicopter's targeting system had mistakenly acquired a target, but denied anyone had been injured.
Interfax did not say when the incident happened, or where, or if the exercise was part of the Zapad-2017 war games.
A second video from the same location, which was posted on social media showed the aftermath.