Documents / FOIA release
This Central Intelligence Agency release, dated 2002-04-08, reproduces an intelligence information report about UFO sightings on the South Korean east coast and north of the Korean Demilitarized Zone. It says the ROK Air Force Chief of Staff briefed security unit commanders in Seoul on 10 and 11 February 1970. Since early 1970, radar stations in Kangwon-do had tracked large balloon-shaped objects, assumed to be dirigibles, that entered ROK airspace and exploded. The Chief of Staff speculated they might be used to drop agents, propaganda or germs.
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FOIA release, from the cia-readingroom collection. The PDF is mirrored here; the original link is under it. The text was read from the page images by an OCR model; expect the odd misread word. 3 pages are in the text index: search them above, or from the library's search.