Alleged UFO spotted over South Korea

The video which was posted on YouTube by crazybreakingnews on April 7 2012, has already been viewed nearly four million times.

The white spherical object which is filmed outside the window of a passenger plane appears to be moving at a similar speed to the plane.

As the passenger tries to zoom in for a closer look the mysterious object, flies out of shot.The clip has provoked mixed response online. Some people have openly declaring it a fake, with explanations ranging from a computer-generated image added to the film afterwards, a water droplet on the plane window or a white plastic bag caught by the wind.