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National UFO Reporting Center
Sighting Report
Occurred : 6/17/2015 21:53 (Entered as : 06/17/15 9:53)
Reported: 6/17/2015 8:15:58 PM 20:15
Posted: 6/19/2015
Location: Lombard, IL
Shape: Unknown
Duration:2 minutes
Black Hawks chasing object outside O'Hare Airspace

We heard this loud sound like bass from a car going by and it was pulsing, like a deep rumble and a beat, and simultaneously, I heard helicopters flying overhead, about 3-4.

I ran outside and saw two helicopters, with their lights on, (trailing behind), and one flying dark, from what I could make out against the clouds (with the lights off). It was cloudy which refracted the light back and this helicopter was flying "dark" but could be seen against the clouds... It was clearly chasing something.

I am right outside class "B" airspace to the southwest, and there was no aircraft in the area (which Is very strange to say the least) for this time of night (I am in the flight path). The noise was unlike any other I have ever heard.

I am a private pilot, and I have been at O'hare when the Osprey land, and Marine 1 lands as well as Air Force 1... It was reminiscent of that but the noise, it was a deep rumble/hum that I could feel in my feet on my hardwood floor. The bass, it was not the chop of rotors, it was a hum for two seconds, and then a higher pitched hum, perhaps two octaves above.

Then it was followed closely with Black Hawk chop of the rotors…

((NUFORC Note: Witness elects to remain totally anonymous; provides no contact information. We assume an evening sighting, and have amended the time above. However, we have no means of contacting the party in order to confirm the time. PD))