This famous UFO case involved the sighting of a huge unidentified triangular-shaped UFO by police officers and others in the early morning hours of January 5, 2000, over the state of Illinois. The officers, from a number of small Illinois towns, were able to track the unknown object and maintain radio contact with each other during the event. Their in-depth testimonies have been fully documented by investigators.
Link to more research at UfoEvidence.org
Incident Recreation Documentary
THE EDGE OF REALITY: ILLINOIS UFO, JANUARY 5, 2000