by over thirty different groups of witnesses, and three separate groups of police officers. All of the reports related a large object flying at low altitude. The craft was of a flat, triangular shape, with lights underneath. This giant craft did not make a sound as it slowly moved across the landscape of Belgium. There was free sharing of information as the Belgian populace tracked this craft as it moved from the town of Liege to the border of the Netherlands and Germany. In The Belgian UFO Wave of 1989–1992 – A Neglected Hypothesis, Renaud Leclet & co. discuss the fact that some sightings can be explained by helicopters. Most witnesses reported that the objects were silent. This report argues that the lack of noise could be due to the engine noise in the witnesses' automobiles, or strong natural wind blowing away from the witnesses. Black triangle UFOs have been claimed to be visible to radar. During the 1989-1990 Belgian UFO wave, two Belgian Air Force F-16s attempted to intercept an object detected by radar, but the pilots did not report seeing an object. This entire Belgian UFO wave, however, has been disputed by skeptics. 1997 Phoenix Lights incident A widely reported appearance(s) of black triangles involved the "Phoenix Lights" events, during which multiple unidentified objects were observed near Phoenix, Arizona and videotaped by both the local media and residents beginning on Thursday, March 13, 1997. Some of the observed objects/lights appeared to be grouped in a large "V" formation that lingered for several minutes. Some residents reported one of the black triangles to be over a mile wide, and that it drifted slowly over their houses blocking out the stars of the night sky. An official report from the US Air Force concluded that the military had been locally testing aircraft-launched flares during that time period. 2000 Southern Illinois incident The "St. Clair Triangle", "UFO Over Illinois", "Southern Illinois UFO", or "Highland, Illinois UFO" sighting occurred on January 5, 2000 over the towns of Highland, Dupo, Lebanon, Shiloh, Summerfield, Millstadt, and O'Fallon, Illinois, beginning shortly after 4:00 am. The incident was featured in several television shows including Seeing is Believing, a Discovery Channel special UFOs Over Illinois, and an episode of the Syfy series Proof Positive. Sufjan Stevens included this incident in the song "Concerning the UFO Sighting Near Highland, Illinois" from his 2005 album Illinois. Science writer Brian