I saw this on TV after I moved back here... It happened before I moved back, but is interesting... Tinley Park is not far from me, less than 10 miles...
Funny enough, there was an Ozzy Osborne concert at the local outdoor theater and many of the patrons saw this and called it in... At first the police thought it was the drugs that most Ozzy fans take, but after many other local residents called it in, they took it more seriously...
