After almost two decades, the mystery of the photograph was finally resolved as the man behind the hoax admitted the picture was a fake.
In a TV interview, one of the forgers admitted that the UFO was made of polystyrene and then photographed.
This Belgian UFO incident is closely related with a period in the country when there were several reports of triangular UFO sightings by the public. Coined as the Belgian UFO Wave, the events lasted from November 1989 to April 1990.
"You can do a lot with a little; we managed to trick everyone with a piece of polystyrene. We made the model with polystyrene, we painted it and then we started sticking things to it, then we suspended it in the air ... then we took the photo," Reuters quoted one of the forgers during an interview with French-language broadcaster RTL.
For years together, this image puzzled scientists and researchers across the world and a search plane was also ordered at that time to hunt down the UFOs across the nation but to no avail.