I was driving down Main Street and noticed a group of people near the sidewalk looking up and pointing at the sky. I was driving in the opposite direction and really wanted to see what they were looking at, so I pulled over into the nearest parking lot, looked up and saw a cluster of what appeared to be very large roundish dark colored UFO's with tails floating high above me. There were at least 30 and all were moving in unison. I watched them float and move slowly through the sky for a couple of minutes. I very quickly moved my car over a few spaces, as my view was partially blocked. I looked up again and they were gone.