WATCH: Caught on camera -- a naked man on the tarmac at Mitchell International Airport

MILWAUKEE -- Caught on camera Wednesday, April 5th at General Mitchell International Airport -- a NAKED MAN on the tarmac!

It happened outside Concourse D.

Airport officials told FOX6 News a man managed to get out onto the tarmac via an emergency exit that's open to the public -- and undress. It sounds unbelievable, but there's video evidence.

Zac Johnson sent in cell phone video showing the man on the tarmac. At first, the video shows him seated, completely naked. Then, the video shows airport officials approaching the man. He then lays down on the ground -- before eventually putting his clothing back on.

Johnson, who is from Oklahoma, was in town for business, and shot the video. He said he didn't expect his trip would involve a naked man at the airport!

It happened on Wednesday afternoon. Johnson said he saw a man outside without a shirt on, and didn't think anything of it until he heard this:

"All of a sudden someone is in the window screaming 'hey -- there's a naked guy out there!' And so I ran over and pulled my phone out and started filming and sure enough, before I know it there's cops all over the place. I never thought that I would see a naked man on the airport terminal. It's kind of bizarre," Johnson said.

Johnson said he saw the man taken into custody at Gate D-27.

Concourse D at General Mitchell International Airport

A spokesman for Mitchell Airport told FOX6 News there is a lower level in Concourse D that's open to the public that is currently being used by OneJet. No planes were landing or taking off from that gate at the time of this incident.

We're told an alarm immediately sounded, and security located the naked man.

An airport spokesman said he wasn't considered a threat based on interviews with authorities.

During this incident, no flights were delayed from deplaning or boarding.

We're told airport officials are reviewing security procedures following this incident -- as the Milwaukee County Sheriff's Office investigates.

FOX6 News has reached out to the Milwaukee County Sheriff's Office for more details on this incident, but we have not yet heard back.

As for Johnson -- he said he's gotten a lot of Facebook friend requests since posting the video to his page!

Concourse D at General Mitchell International Airport

Monitor FOX6 News and for updates on this developing story.