Round UFO seen over Indiana in 1949

Summary

In April 1949, a classified report reached military authorities after a civilian made a long-distance call. The witness described round objects resembling balloons moving at high speed and altitude over Indianapolis. Although the testimony was brief and no further details were obtained, the case was escalated to higher Air Force levels. The lack of concrete information, such as the observer's identity or physical evidence, led to a conclusion of insufficient data for evaluation. Yet the mystery remains: what could explain a phenomenon that vanished without a trace?