Police in Prophetstown, Illinois, are trying to identify a mysterious UFO that was spotted by multiple witnesses this week, including the Chief of Police.

“I was off duty sitting at home and I got a phone call from a man we call ‘Rocky Ballard,’” said Prophetstown police chief Bruce Franks. “He works at Todd’s Tire and Auto, and he says ‘Hey, I see what looks like a balloon and it hasn’t moved in the past 20 minutes.’”

“Rocky says it’s right up there, and he points to it and sure enough, there it was — and it didn’t move forever,” Franks added.

“Looked like kind of a clear plastic balloon, and what it was doing, we have no idea,” said Officer Boyd Van Dellen.

Van Dellen continued, “We then notified the Quad Cities airport to notify the towers, at least let aircraft know. It looked high enough that it was possibly in airspace.”

The National Weather Service in the area reported that they had not deployed any weather balloons that day.