A CCTV camera installed in the industrial site in Prokopyevsky, Russia, has captured unknown objects flying near the complex.
The incident was first reported by Alien Disclosure Group (ADG) last year in June. The group posted the CCTV footage on YouTube on 4 June 2013.
The 46 second clip shows a glowing object hurtling down at some speed to a darkened area near the industrial site in Prokopyevsky.
Viewers have given mixed reaction on the YouTube video. One user named Gery Satriawan has said that the glowing object can be possibly "US drones used for spying".
Russell Davies, another user, has explained why the alleged UFOs appear during night time.
"I see up to 12 of these a day in Shrewsbury UK, you can call them, they respond to telepathic communication. They generally appear at night in order to evade detection by a paranoid and largely hostile military," Davies commented on the YouTube page.
"They are probes sent out from ET mother-ships, and are here simply to catalogue the state of the biosphere-earth and even to monitir human emotions, as well as behavior."
In the past few years, number of UFO sightings is believed to have increased across the world.
Recently, a video showing a supposedly triangle shaped object attacking a camp in Taliban has gone viral. The footage was reportedly recorded by in Asadabad, Afghanistan by US Marines.
However, the video has not been authenticated by any officials. The video was uploaded on YouTube by "Section 51" on 5 May and since then it has been viewed by more than 970,000 times. [Read the full story here]
Watch the video here: