White UFO with red flashes over South Dakota

Summary

An observer in Sioux Falls, South Dakota, reported a bright, round object with occasional red flashes every 15-30 seconds. The object zigzagged toward the northeast before disappearing behind trees. The report notes the observer used a telescope and binoculars, and the sighting lasted 10-15 minutes. Although an aircraft was considered, no clear explanation was found. The official report lacks physical evidence or photos, and the observer's reliability was not clearly assessed.