It looked similar in shape to the DH108 Swallow seen at the top of this website https://en.wikipedia.org/wiki/Tailless_aircraft
The best likeness I have found online (except the wings were flat and what looks like 2 large engines could have been propellers but I don't think they were that large) is found here:
https://www.nbcnews.com/mach/mach/th...ays-ncna745806
It is the 3rd image from the top: "Dzyne's Blended Wing Body concept. Dzyne Technologies"