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National UFO Reporting Center
Sighting Report
Occurred : 5/21/1998 21:30 (Entered as : 05/21/98 21:30)
Reported: 9/23/1998 16:22
Posted: 3/21/2003
Location: Denver, CO
Shape: Flash
Duration:30 minutes
Humming then a loud subsonic boom or explosion

Humming then object appeared in sky a loud boom or explosion then several flashes . Appeared to be decending after boom.