A GROUP of youths have been seen on the former North Wales Hospital site following a devastating fire.

It is understood the youths were on the roof of the Denbigh-based building when North Wales Police were called just before 6pm yesterday.

Police attended the scene and spoke to the group about their behaviour.

A spokesperson for North Wales Police said: "We approached some members of the group and discussed the dangers of entering the site, and said that their parents would be contacted."

A resident from Denbigh posted on social media that she had seen two teenage boys on the roof of the former hospital's Nurse Building, when she made a call to the police.

This follows the huge blaze on Wednesday that required the services of about 40 firefighters. The fire is now being treated as arson.

Upon the launch of an investigation into the fire, North Wales Fire and Rescue Service senior fire safety manager, Kevin Roberts, said: “We would discourage anyone from entering the buildings in the interests of their own safety. These incidents are putting the lives of firefighters and the public at risk."

North Wales Police Detective Inspector, Simon Kneale, added: “We are working closely with North Wales Fire and Rescue Service on this investigation. I would appeal to anyone who has information or who may have seen any suspicious activity at the site yesterday or over the weekend to contact us on 101 quoting reference W042193.”