GWENT Police has warned youngsters against copying extreme stunts after a video of two Newport boys climbing up the George Street Bridge has been viewed over 48,000 times.

The video, which has sparked both horror and praise among viewers, shows the two teenagers climbing the 171 ft bridge before sliding down it with the road down below.

The two teenagers are part of Welsh group Feral Freerun, which has seen its five members scale landmarks like the Newport Transporter Bridge and buildings around Cardiff and Newport – but all without any safety harnesses.

Gwent Police’s Chief Inspector for Newport, Jo Bull, said: “These two boys are putting themselves and others in extreme danger in return for a quick adrenaline rush.

“We cannot over emphasise the clear risks involved in this type of activity, and strongly advise against anyone doing anything similar.”

Police are urging parents to speak to their children about the dangers involved and to warn them of the possible consequences.

Ch Insp Jo Bull added: “Sharing and drawing attention to this kind of activity is irresponsible, and potentially could lead to copycat incidents which could result in serious injury, if not worse.

“Now this has been brought to our attention, we will be making further enquiries into offences being committed here, including causing danger to road users.”

18-year-old Jake Smith, who is one of the boys featured in the video and has been freerunning for six years, said he also does not encourage others trying the stunt.

He said: “We are not just really stupid kids. We are definitely aware of our bodies and what we can do and we don’t do anything we’re not confident we can do. "Obviously we do it for a thrill so we have a bit of anxiety.

“But we are not saying anyone should do this. We know our limits.”

On facebook the video, which was posted on Thursday, June 25, has been shared more than 1,300 times and has invited a range of reactions. Some have praised the stunt while others have called the pair “nutcases” and “stupid”.