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National UFO Reporting Center Sighting Report
Occurred : 6/12/2010 21:50 (Entered as : 06/12/10 21:50)
Reported: 6/12/2010 9:40:52 PM 21:40
Posted: 6/23/2010
Location: Chicago, IL
Duration: 10-15 min
Weird banging noises @ 4 different corners at a time in the sky lasting for 10-15 min.

Heard what sounded like weird banging noises at four separate corners of the sky, each taking turns banging. It was nothing we had ever heard and as consistent as a heart beat. Almost like thunder but each was about 10 secondsí apart give or take. This lasted for about 10 to 15 min. It sounded like the ground was thumping.