From the files of Project Blue Book. This event was more extensively detailed in its investigation than others, and the conclusion was that it was a common airplane.
To view more incidents from around the world, go here.
UFO Database
From the files of Project Blue Book. This event was extensively investigated due to the military source of the report. The conclusion was that it was “probably” a balloon.
For more incidents around the world, visit the following links.
UFO Database
Mutual UFO Network
National UFO Reporting Center