Shocking footage posted online has captured the moment a group of teens climbed to the top of a massive crane in the city centre.

A video on Instagram by @itz.makapaka shows a group of teenagers larking about on top of the structure overlooking St Crispins House in Duke Street.

The prank has been described as “obviously” dangerous by Norfolk Constabulary.

Norwich Evening News: The footage shows three teenagers standing on top of the construction craneThe footage shows three teenagers standing on top of the construction crane (Image: Instagram @itz.makapaka)

The site is currently being developed with McAleer & Rushe brought on as contractors.

A spokeswoman for the business said it was aware of the trespassing and had reported the incident to police.

She added: “We have robust health, safety and security measures in place and we take every precaution possible to secure our sites from unauthorised entry.

“Across all our sites we have signposting in place of the dangers of unauthorised entry and we would urge everyone to respect and follow this guidance.”

Norwich Evening News: The footage captured shows Anglia Square and St Georges Street belowThe footage captured shows Anglia Square and St Georges Street below (Image: Instagram @itz.makapaka)

A spokeswoman for the police added the stunt had not just put the individuals in danger but the public too.

“The dangers of this kind of behaviour are obvious.

"The individuals involved are placing both themselves and the immediate public at risk.

Norwich Evening News: The construction crane which overlooks St Crispins HouseThe construction crane which overlooks St Crispins House (Image: Archant)

"While we have had no reports of this kind, we are reaching out to the business owner to raise awareness of the issue and ensure that sites are properly secured.

"We would encourage anyone who witnesses behaviour of this nature to report it to Norfolk Police online or by phoning 101,” she said.

It comes amid rising concerns for these sorts of antics, after a man climbed and parachuted off the crane at Norwich Castle in July.

Norwich Evening News: The McAleer & Rushe construction site in St Crispins HouseThe McAleer & Rushe construction site in St Crispins House (Image: Archant)

Passing by the site was Atul Patel, an assistant manager at Wilko who often uses the route.

The 34-year-old said the incident “puts a strain on the emergency services”.

He continued: “It’s scary to think teenagers could get up there – if I had kids I wouldn’t let them near it.

Norwich Evening News: Atul Patel, a 34-year-old assistant manager at WilkoAtul Patel, a 34-year-old assistant manager at Wilko (Image: Archant)

“Not only is it a danger to the people up the crane but also the public.

"Imagine if they were to drop something from that height - it would be fatal.

"At the time the consequences of such actions don't go through your head.

"I don’t even know how they got in.”