I was 9years old, on hallyday with my brother and my mother in the camping of Stupice on a half-ile near Pula in Croatia. That summer was exetremely hot and dry. The whole day we were hearing and seeing military reactive airplains flying exetremely low. That evening we went to eat in a local restaurant, we set outside. Suddenly amongst the overflights of military airplains a huge object came out from behind the pines. It was boomerang shaped, black and full of coloured lights. It was advancing very slowly in a straight line during 5 to 10 minutes. I am not able to recall the end of the seing. I can suddenly recall the event thanks to an image in the generic of Hangar #1.