UPDATED: Friday, Nov. 20, 2015 at 2:17 p.m.

Someone who was driving on 31st Street Friday morning posted a short video of a naked man running westbound past the Blue Water Lounge. It's not clear when the viceo was shot, but the video was posted to Facebook at about 10 a.m.

After receiving multiple calls about the man at about 9:30 a.m., police searched for him but couldn't find him. At the time, however, the man was running eastbound on the south side of 31st Street. From the 10-second video, it appears that the man crossed 31st Street and ran back west.

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Brookfield police say they were unable to locate a man — completely naked — who was reported to be running eastbound on 31st Street on Friday morning.

Lt. Edward Petrak said that Brookfield police received several calls that a stark-naked man, not wearing any shoes, was running on the south side of 31st Street east from Park Avenue toward Prairie Avenue at about 9:30 a.m.

But the man apparently covered quite a bit of ground. A Berwyn woman who was driving westbound on 31st Street at about 9:25 a.m. placed the man west of Maple Avenue at that time.

"I'm driving west on 31st Street and all of a sudden to my left I see this guy running," the woman said. "And my first thought is, 'He doesn't have any clothes on.' Then I thought maybe he was wearing a body suit, but I looked my rearview mirror, and I could see his butt."

According to the woman, the man didn't appear to be fleeing anything.

"He looked like a runner, like a guy who runs all the time," she said.

At 9:30 a.m. on Friday, the outside temperature was about 40 degrees.

Where the man ended up is unclear, though he may have wound up running into the forest preserves east of Praire Avenue. It doesn't appear that he made it all the way to Riverside, because Riverside Police Chief Thomas Weitzel said there have been no reports of a naked man running through that village.

However, Riverside did receive several 911 cell phone calls about the man running in Brookfield. They transferred those calls to the Brookfield Police Department, Weitzel said.