The footage, posted on video-sharing website YouTube, was filmed near the BBC Radio 1 building in Great Portland Street and it shows specks of white light flying at high altitude over the capital.
A larger object, assumed to be a mothership, then emerges from behind a cloud before vanishing moments later, the Daily Telegraph reported.
The YouTube user who posted the video online wrote: "Right -- took over a week to get it ... but finally managed to get these critters on camera on a clear day, and even get a close-up.
"It seems to be attracting quite a crowd now when they appear. Can anyone explain what on earth these lights are please?"
A separate video posted by the same user is believed to have been shot from inside the offices of a visual effects company called The Mill. The firm creates special effects for the film industry.
Published 27 June 2011, 12:20 IST