Happened in Bilbao 17:30 Saturday.One craft flaying in right line, and at the same time, it was balanced on its axis about 45º aprox.It was of form made oval with a species of wings behind I seen the craft about 15 min with prismaticos, eyeglasses, and its color was green very dark. The objet was moved at little speed, but a traffic helicopter arrived suddenly at the zone, and the craft flew hardly in seconds very high and disappeared of my vision.I had never seen something like this.((NUFORC Note: Date is approximate. PD))