Same type of sighting happened in upstate NY. Some say it was low flying plane formations pulling a hoax. Looks very simular though to this story...cops seeing it etc.
I lived in that area and it was very popular for sightings. One night many people in my town saw a strange gray object just hovering over the mountains. If I did not see it with my own eyes I would have not believed. Who know what it was but I am love this stuff.
happy reading.
http://www.ufoevidence.org/topics/HudsonValley.htm