History has revealed that occasionally UFOs seem to move in waves. Rather than a typical UFO sighting of one or a few craft in a short period of time which soon disappear, the UFOs involved in a wave return repeatedly, causing uncertainty in the population. In 1952 Washington DC was the scene of waves in two weekends in a row, and in 1989 Belgium was the location of quite possibly the largest UFO wave in history. When UFOs travel in a wave they typically move slowly and methodically, seemingly with purpose and apparently unafraid of being witnessed. During this wave, craft were reported to be triangular in shape with rounded edges and lighting underneath and you can learn the rest of this interesting event HERE.