lights around it. >> what made the tinley park sighting very promising is the volume of video footage. the other thing, this is a mass sighting. i'm talking 100 people or more seeing the same event from various perspectives. we had military personnel, we had municipal employees and police officers as witnesses, doctors, lawyers, amateur astronomers, meteorologists, et cetera. >> some witnesses take the sighting more seriously than others. >> it's so cool. we could actually be invaded by aliens. in a year we could see them again, and our entire species could i do out from it because of aliens -- aliens could take over the world. >> well that night a police officer stopped by, and she said they were getting inundated with calls left and right about this ufo. >> two months later on halloween night, tinley park residents are once again looking up. >> the three lights were back again. and that's when i hightailed it home, grabbed the video recorder and started shooting again. okay, the ufos are back. i'm out of breath. here they're coming again -- there's airplanes in the air. >> are those