An infamous 'free climber' has posted a first-person video shot on a crane hundreds of feet above London.
The video, recorded with a head-mounted mini camera, shows a group of teenagers on the Wallington Crane above south London.
The teens have no safety equipment and are totally exposed to the elements.
At one point in the climb one of the teenagers hangs from the crane, before just managing to haul himself back up.
The teenagers say they are 'free runners' - and several other videos posted by the group appear to bear this out.
But the police condemned the video of the Wallington climb, and said they were aware of the video.
Following footage brought to our attention, thrill-seeking free running will not be tolerated and offenders will be dealt with robustly.— Sutton MPS (@MPSSutton) February 19, 2014