Miami Police are looking for the daredevil responsible for hanging from a 50-story crane in downtown Miami with just one hand.
Police say he is a threat to himself and potentially others.
"The message from the Miami police department is we don't want anyone else doing it, just imagine a teenager trying to do it," Officer Kenia Fallat said.
The daredevil, who doesn't want his name released, wears a mask and uses a selfie stick to show himself at the top of the construction site. At one point, he shows himself crossing a narrow beam from a dizzying height.
"He's risking his life but what we don't want are others to copy him, and indeed it's not only dangerous but also illegal,” she added.
Miami police are distributing pictures of him taken from his social media videos. In the photos, you can clearly see his face. The man has a GoPro camera strapped to his head.
"We can't release a name right now but we have a picture of him and we believe he is not acting alone," Fallat said.
Police also believe another man is involved in trespassing with the daredevil.
If you have any information, police urge you to call Miami-Dade Crimestoppers at (305) 453-TIPS.