Cases
Illinois Triangle UFO Sighting (by multiple police officers)
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. Police Confirmed UFO Sighting | National Geographic: https://www.youtube.com/watch?v=tsyD3_KHwCY
See more (external link) 
http://www.ufoevidence.org/cases/case277.htm