Huge ‘flying saucer cloud’ looms over Moscow in spooky footage sparking fears of an ‘alien invasion’

The unusual weather phenomenon was filmed by an eyewitness with a smartphone who spotted it over the city's Adropov Avenue.

The UFO cloud is believed to have been an unusually-shaped cumulus – a fluffy low level cloud.

However, some observers speculated that it might have been a lenticular cloud.

They are often mistaken for UFOs because of their characteristic appearance and smooth saucer-like shape.