Watch as prankster films himself wandering around Dunbar cement factory for Youtube

A PRANKSTER has sparked a major security alert at an East Lothian cement factory after wandering in and filming his walkabout.

Online footage shows YouTuber Jaimieboy sneaking past security before clambering up to the roof of Tarmac’s Dunbar and giving a thumbs up outside the control room.

Bosses vowed to beef-up security amid safety fears while the police confirmed no law had been broken during the nighttime stunt.

Oliver Curtin, plant manager at Dunbar Cement plant said: “We are aware of the video online of a person trespassing at the cement plant and the incident has been reported to the police.

“In the meantime, we are increasing security at the site with immediate effect.”

Donning a head-cam, Jaimieboy’s video shows him slipping into the factory past a guard in the security lodge.

He then scales a gantry before working his way through up a staircase to the roof from where he peers over the edge.

Finally, he makes his way inside to the central control room where he gives his reflection a thumbs up.

Mr Curtin added: “Cement plants can be dangerous places. Our employees and contractors undertake many hours of training and safety inductions before being allowed on site.

“No one should enter the site without permission, and we would urge people to stay out and stay safe.”

The Evening News reported last month how Jaimieboy clambered up one of the giant cranes used to construct the billion pound new St James Centre.

His actions were slammed as "dangerous and irresponsible" by contractors Laing O'Rourke.

But Jaimieboy said taking on such incredible heights was a “challenge” and climbing the crane was a spur of the moment decision.

He added: “I love making videos and I have always been infatuated with cranes. I didn’t even plan to do it.

“I used to get drunk or smoke but I stopped. I still need to get a buzz and I do it to feel alive. Climbing and doing missions like that I find amazingly fun."

Jaimieboy said he regularly climbs radio masts and cranes - often enjoying trying to get past security around high-profile developments - to get photos no-one else gets.

He added: "The worst thing that could happen is the police get called and they try to use wasting police time.

"I really regret wasting my life drinking and all you hear is sirens for them going after drunk people. What I am doing is harmless, I am harming no one and giving people something to watch on YouTube.

"I didn't do it to get in trouble, I did it for the photographs and getting shots no-one else gets."

A Police Scotland spokesman said of his latest stunt: “We are aware of the incident but there has been no criminality established.”