Date: August 7, 1952
Location: Kerkrade, Netherlands

On the night of August 6-7, 1952, Will Jansen, a marine engineer and designer, was visiting in Kerkrade, Holland. Just after midnight a disc-shaped craft with visible superstructure swooped down to low altitude, hovered, zigzagged and sped away. A second disc-shaped UFO, similar in outline, was then seen hovering farther away. Finally it tilted up vertically and shot up out of sight.

First of two discs observed by Will Jansen. "Cabin" protruded from
underside too on second UFO. (credit: NICAP/Hall)

Source: NICAP/Richard Hall, 1964 (from letter to CSI of Los Angeles)

On the night of August 6-7, 1952, Will Jansen, a marine engineer and designer, was visiting in Kerkrade, Holland. Just after midnight, a disc-shaped craft with visible superstructure swooped down to low altitude, hovered, zigzagged and sped away. A second disc-shaped UFO, similar in outline, was then seen hovering farther away. Finally, it tilted up vertically and shot up out of sight.

 

Source: http://www.ufoevidence.org/cases/case647.htm