Summary : During an IYCW (International Youth Camp Weekend), when we were sitting in groups of different campfires in an area of a quarter of one square mile, this happened: <p> A green spot(possible UFO) in the black sky appeared, and as it got bigger and bigger there evolved a very oppressive and unbearable sound; just as if it was about to crash into our camp.. All of the present people could clearly hear this and everyone got severely hurt in their ears from the sound. This lasted for about five minutes. <p> After this there was an enormous bang and