Mysterious footage purporting to show a UFO moving slowly and silently through the sky over an estate in Nairobi has 'shocked' the witnesses who filmed it.

The shocking clip was captured in an unknown area of Nairobi, by two people who can be heard reacting in disbelief as the disk-shaped object 'spins' above them.

Similar reports have been heard about within Nairobi with residents worried about the impending danger.

See the video below: