Tyrell: Free medical insurance motilium price Over a five month period in 1990, 13,500 people claimed to have seen large, silent, black triangles with lights flying low over parts of Belgium. Around 2,600 of the individuals filed written statements testifying that they had seen the UFO's in person. The UFO sightings peaked on the night of March 30, 1990. The flying objects were reportedly tracked on radar and chased by two Belgian Air Force F-16's. The Belgian Air Force released a detailed report of the incident.