Police have issued a warning after footage emerged of a man jumping between two new houses on a building site.
The man, believed to be a freerunner or parcour participant, leaps between the roofs of the two-storey houses on a new estate in West Park, Darlington.
He lands with a huge clatter on the neighbouring roof, watched by laughing onlookers who are filming his exploits.
Police in Darlington shared what they said was "alarming footage" on their Facebook page, saying: "We're sure you can see how easily this might have ended in tragedy.
"Young people so often think they're invincible and don't think through the potential consequences of their actions.
"Please talk about this video to your friends and family. Please keep safe."
Scores of people have commented on the video, with the vast majority criticising the jumper for risking his life.
One said: "Would not look so cool lying in a hospital bed being fed by a nurse unable to move!!!"