As reported
Triangle over Luxembourg (City) (Luxembourg)
A witness account on file, unevaluated. Most of the archive rests here, and honestly so.
The report, as filed
Low altitude Triangle shaped UFO over Luxembourg City , 3 white light 1 red light in center.
Held as-reported from National UFO Reporting Center. Witness text is preserved verbatim, including its spelling; nothing is edited beyond formatting.