Belgian Wave
The 1989–1990 Belgian UFO sighting wave, featuring thousands of witness reports of large triangular craft and an officially-released military intercept report from the night of 30–31 March 1990.
The Belgian Wave (French: Vague d’OVNI sur la Belgique) refers to the sustained UFO sighting wave that occurred over Belgium between November 1989 and April 1990. It is one of the largest mass-witness UAP episodes in European history, documented in the Council’s archive as Case #00056.
What was reported
Across the wave’s roughly five-month duration, witnesses across Belgium — particularly in the Wallonia region of the country’s southeast — consistently described:
- A large triangular or boomerang-shaped craft.
- Three white lights at the corners, with a red light at the center.
- Slow, silent movement at low altitude.
- The ability to hover in place before moving.
Witness count estimates exceed 13,000 across the wave, including hundreds of reports filed by police officers and gendarmerie personnel who were on duty when sightings occurred.
The 30–31 March 1990 incident
The wave’s most-documented single incident occurred on the night of 30–31 March 1990, when the Belgian Air Force scrambled two F-16 fighters from Beauvechain Air Base in response to multiple ground reports and corroborating ground radar contacts. The interceptors reportedly achieved several brief radar locks on contacts that performed accelerations and altitude changes outside the F-16’s performance envelope.
The Belgian Air Force’s official report on the incident — signed by Maj. Wilfried De Brouwer, later promoted to general — was released to the public and remains one of the most-cited military UAP documents in Europe.
The Petit-Rechain photograph
The single most-reproduced image associated with the Belgian Wave — known as the Petit-Rechain photograph, taken on 4 April 1990 — was admitted in 2011 by its purported photographer to be a fabrication using a stage prop. This admission damaged the iconography of the wave but does not address the underlying witness reports or the official military radar incident.
The Council treats the Petit-Rechain admission as evidence about that specific photograph and not as evidence about the wave as a whole.
Status
The Belgian Wave remains, by any reasonable evidentiary measure, the strongest European mass-witness UAP case of the post-Roswell era. The Council assigns Case #00056 a verdict of Inconclusive: the evidence is strong enough to merit serious treatment, no proposed mundane explanation cleanly accounts for the 30–31 March 1990 incident, and the radar tapes have not been released in raw form.
For comparable cases, see the Phoenix Lights triangular formation (Case #00013) and the Hudson Valley wave (Case #00098, attributed to ultralight aircraft formations and assigned Debunked).