Multiple witnesses observe a peculiar ring of lights in Minneapolis, Minnesota, August 9, 2015

On Sunday, August 9, 2015, multiple witnesses observe a peculiar ring of lights in Minneapolis, Minnesota, which hovered in the nighttime sky for up to an hour, according to The National UFO Reporting Center. At least one witnesse reports that the lights were visible for up to an hour. 

''We wonder whether the formation might have been advertising lights, but some witnesses reported that some of the lights disappeared before the rest of them did, which seems to us to militate against their being part of an advertising display.''

Source: http://www.nuforc.org